47 files changed, 717 insertions, 290 deletions

diff --git a/browser/components/translations/tests/browser/browser.toml b/browser/components/translations/tests/browser/browser.toml
index bc617bf2fd..a9d36363da 100644
--- a/browser/components/translations/tests/browser/browser.toml
+++ b/browser/components/translations/tests/browser/browser.toml
@@ -15,96 +15,100 @@ support-files = [
 
 ["browser_translations_about_preferences_settings_ui.js"]
 
-["browser_translations_panel_a11y_focus.js"]
+["browser_translations_full_page_panel_a11y_focus.js"]
 
-["browser_translations_panel_always_translate_language_bad_data.js"]
+["browser_translations_full_page_panel_always_translate_language_bad_data.js"]
 
-["browser_translations_panel_always_translate_language_basic.js"]
+["browser_translations_full_page_panel_always_translate_language_basic.js"]
 
-["browser_translations_panel_always_translate_language_manual.js"]
+["browser_translations_full_page_panel_always_translate_language_manual.js"]
 
-["browser_translations_panel_always_translate_language_restore.js"]
+["browser_translations_full_page_panel_always_translate_language_restore.js"]
 
-["browser_translations_panel_app_menu_never_translate_language.js"]
+["browser_translations_full_page_panel_app_menu_never_translate_language.js"]
 
-["browser_translations_panel_app_menu_never_translate_site.js"]
+["browser_translations_full_page_panel_app_menu_never_translate_site.js"]
 
-["browser_translations_panel_auto_translate_error_view.js"]
+["browser_translations_full_page_panel_auto_translate_error_view.js"]
 
-["browser_translations_panel_auto_translate_revisit_view.js"]
+["browser_translations_full_page_panel_auto_translate_revisit_view.js"]
 
-["browser_translations_panel_basics.js"]
+["browser_translations_full_page_panel_basics.js"]
 
-["browser_translations_panel_button.js"]
+["browser_translations_full_page_panel_button.js"]
 
-["browser_translations_panel_cancel.js"]
+["browser_translations_full_page_panel_cancel.js"]
 
-["browser_translations_panel_close_panel_never_translate_language_with_translations_active.js"]
+["browser_translations_full_page_panel_close_panel_never_translate_language_with_translations_active.js"]
 
-["browser_translations_panel_close_panel_never_translate_language_with_translations_inactive.js"]
+["browser_translations_full_page_panel_close_panel_never_translate_language_with_translations_inactive.js"]
 
-["browser_translations_panel_close_panel_never_translate_site.js"]
+["browser_translations_full_page_panel_close_panel_never_translate_site.js"]
 
-["browser_translations_panel_engine_destroy.js"]
+["browser_translations_full_page_panel_engine_destroy.js"]
 
-["browser_translations_panel_engine_destroy_pending.js"]
+["browser_translations_full_page_panel_engine_destroy_pending.js"]
 
-["browser_translations_panel_engine_unsupported.js"]
+["browser_translations_full_page_panel_engine_unsupported.js"]
 
-["browser_translations_panel_engine_unsupported_lang.js"]
+["browser_translations_full_page_panel_engine_unsupported_lang.js"]
 
-["browser_translations_panel_firstrun.js"]
+["browser_translations_full_page_panel_firstrun.js"]
 
-["browser_translations_panel_firstrun_revisit.js"]
+["browser_translations_full_page_panel_firstrun_revisit.js"]
 
-["browser_translations_panel_fuzzing.js"]
+["browser_translations_full_page_panel_fuzzing.js"]
 skip-if = ["true"]
 
-["browser_translations_panel_gear.js"]
+["browser_translations_full_page_panel_gear.js"]
 
-["browser_translations_panel_never_translate_language.js"]
+["browser_translations_full_page_panel_never_translate_language.js"]
 
-["browser_translations_panel_never_translate_site_auto.js"]
+["browser_translations_full_page_panel_never_translate_site_auto.js"]
 
-["browser_translations_panel_never_translate_site_basic.js"]
+["browser_translations_full_page_panel_never_translate_site_basic.js"]
 
-["browser_translations_panel_never_translate_site_manual.js"]
+["browser_translations_full_page_panel_never_translate_site_manual.js"]
 
-["browser_translations_panel_retry.js"]
+["browser_translations_full_page_panel_retry.js"]
 skip-if = ["os == 'linux' && !debug"] # Bug 1863227
 
-["browser_translations_panel_settings_unsupported_lang.js"]
+["browser_translations_full_page_panel_settings_unsupported_lang.js"]
 
-["browser_translations_panel_switch_languages.js"]
+["browser_translations_full_page_panel_switch_languages.js"]
 
-["browser_translations_reader_mode.js"]
+["browser_translations_full_page_reader_mode.js"]
 
-["browser_translations_select_context_menu_feature_disabled.js"]
+["browser_translations_full_page_telemetry_firstrun_auto_translate.js"]
 
-["browser_translations_select_context_menu_with_full_page_translations_active.js"]
+["browser_translations_full_page_telemetry_firstrun_basics.js"]
 
-["browser_translations_select_context_menu_with_hyperlink.js"]
+["browser_translations_full_page_telemetry_firstrun_translation_failure.js"]
 
-["browser_translations_select_context_menu_with_no_text_selected.js"]
+["browser_translations_full_page_telemetry_firstrun_unsupported_lang.js"]
 
-["browser_translations_select_context_menu_with_text_selected.js"]
+["browser_translations_full_page_telemetry_open_panel.js"]
+
+["browser_translations_full_page_telemetry_panel_auto_offer.js"]
 
-["browser_translations_telemetry_firstrun_auto_translate.js"]
+["browser_translations_full_page_telemetry_panel_auto_offer_settings.js"]
 
-["browser_translations_telemetry_firstrun_basics.js"]
+["browser_translations_full_page_telemetry_switch_languages.js"]
 
-["browser_translations_telemetry_firstrun_translation_failure.js"]
+["browser_translations_full_page_telemetry_translation_failure.js"]
 
-["browser_translations_telemetry_firstrun_unsupported_lang.js"]
+["browser_translations_full_page_telemetry_translation_request.js"]
 
-["browser_translations_telemetry_open_panel.js"]
+["browser_translations_select_context_menu_feature_disabled.js"]
+
+["browser_translations_select_context_menu_with_full_page_translations_active.js"]
 
-["browser_translations_telemetry_panel_auto_offer.js"]
+["browser_translations_select_context_menu_with_hyperlink.js"]
 
-["browser_translations_telemetry_panel_auto_offer_settings.js"]
+["browser_translations_select_context_menu_with_no_text_selected.js"]
 
-["browser_translations_telemetry_switch_languages.js"]
+["browser_translations_select_context_menu_with_text_selected.js"]
 
-["browser_translations_telemetry_translation_failure.js"]
+["browser_translations_select_panel_language_selectors.js"]
 
-["browser_translations_telemetry_translation_request.js"]
+["browser_translations_select_panel_mainview_ui.js"]
diff --git a/browser/components/translations/tests/browser/browser_translations_panel_a11y_focus.js b/browser/components/translations/tests/browser/browser_translations_full_page_panel_a11y_focus.js
index e2e8663f6d..433861c05a 100644
--- a/browser/components/translations/tests/browser/browser_translations_panel_a11y_focus.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_panel_a11y_focus.js
@@ -17,7 +17,7 @@ add_task(async function test_translations_panel_a11y_focus() {
     "The button is available."
   );
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     openWithKeyboard: true,
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
   });
diff --git a/browser/components/translations/tests/browser/browser_translations_panel_always_translate_language_bad_data.js b/browser/components/translations/tests/browser/browser_translations_full_page_panel_always_translate_language_bad_data.js
index ac026fb78f..144488ac7b 100644
--- a/browser/components/translations/tests/browser/browser_translations_panel_always_translate_language_bad_data.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_panel_always_translate_language_bad_data.js
@@ -13,7 +13,7 @@ add_task(async function test_always_translate_with_bad_data() {
     prefs: [["browser.translations.alwaysTranslateLanguages", "en,fr"]],
   });
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
     openFromAppMenu: true,
   });
@@ -23,8 +23,7 @@ add_task(async function test_always_translate_with_bad_data() {
     checked: false,
     disabled: true,
   });
-  await closeSettingsMenuIfOpen();
-  await closeTranslationsPanelIfOpen();
+  await closeAllOpenPanelsAndMenus();
 
   info("Checking that the page is untranslated");
   await runInPage(async TranslationsTest => {
diff --git a/browser/components/translations/tests/browser/browser_translations_panel_always_translate_language_basic.js b/browser/components/translations/tests/browser/browser_translations_full_page_panel_always_translate_language_basic.js
index 2644d78f33..bd9a8a7756 100644
--- a/browser/components/translations/tests/browser/browser_translations_panel_always_translate_language_basic.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_panel_always_translate_language_basic.js
@@ -21,7 +21,7 @@ add_task(async function test_toggle_always_translate_language_menuitem() {
 
   await FullPageTranslationsTestUtils.assertPageIsUntranslated(runInPage);
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
   });
   await FullPageTranslationsTestUtils.openTranslationsSettingsMenu();
@@ -55,7 +55,7 @@ add_task(async function test_toggle_always_translate_language_menuitem() {
     "The page should be automatically translated."
   );
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewRevisit,
   });
   await FullPageTranslationsTestUtils.openTranslationsSettingsMenu();
diff --git a/browser/components/translations/tests/browser/browser_translations_panel_always_translate_language_manual.js b/browser/components/translations/tests/browser/browser_translations_full_page_panel_always_translate_language_manual.js
index 8456b4cc08..d47732aa5c 100644
--- a/browser/components/translations/tests/browser/browser_translations_panel_always_translate_language_manual.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_panel_always_translate_language_manual.js
@@ -22,7 +22,7 @@ add_task(
 
     await FullPageTranslationsTestUtils.assertPageIsUntranslated(runInPage);
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
     });
 
@@ -36,7 +36,7 @@ add_task(
       runInPage
     );
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewRevisit,
     });
     await FullPageTranslationsTestUtils.openTranslationsSettingsMenu();
@@ -55,7 +55,7 @@ add_task(
       runInPage
     );
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewRevisit,
     });
     await FullPageTranslationsTestUtils.openTranslationsSettingsMenu();
diff --git a/browser/components/translations/tests/browser/browser_translations_panel_always_translate_language_restore.js b/browser/components/translations/tests/browser/browser_translations_full_page_panel_always_translate_language_restore.js
index 6cf89d2a03..cd3fe76c58 100644
--- a/browser/components/translations/tests/browser/browser_translations_panel_always_translate_language_restore.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_panel_always_translate_language_restore.js
@@ -22,7 +22,7 @@ add_task(
 
     await FullPageTranslationsTestUtils.assertPageIsUntranslated(runInPage);
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
     });
     await FullPageTranslationsTestUtils.openTranslationsSettingsMenu();
@@ -56,7 +56,7 @@ add_task(
       "The page should be automatically translated."
     );
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewRevisit,
     });
 
@@ -69,7 +69,7 @@ add_task(
 
     await FullPageTranslationsTestUtils.assertPageIsUntranslated(runInPage);
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
     });
     await FullPageTranslationsTestUtils.openTranslationsSettingsMenu();
diff --git a/browser/components/translations/tests/browser/browser_translations_panel_app_menu_never_translate_language.js b/browser/components/translations/tests/browser/browser_translations_full_page_panel_app_menu_never_translate_language.js
index ee2905ab99..14eb88f71f 100644
--- a/browser/components/translations/tests/browser/browser_translations_panel_app_menu_never_translate_language.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_panel_app_menu_never_translate_language.js
@@ -22,7 +22,7 @@ add_task(async function test_uncheck_never_translate_language_shows_button() {
 
   await FullPageTranslationsTestUtils.assertPageIsUntranslated(runInPage);
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     openFromAppMenu: true,
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
   });
diff --git a/browser/components/translations/tests/browser/browser_translations_panel_app_menu_never_translate_site.js b/browser/components/translations/tests/browser/browser_translations_full_page_panel_app_menu_never_translate_site.js
index 50fff4dff8..3670bb7ba1 100644
--- a/browser/components/translations/tests/browser/browser_translations_panel_app_menu_never_translate_site.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_panel_app_menu_never_translate_site.js
@@ -21,7 +21,7 @@ add_task(async function test_uncheck_never_translate_site_shows_button() {
     "The translations button is visible."
   );
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
   });
   await FullPageTranslationsTestUtils.openTranslationsSettingsMenu();
@@ -36,7 +36,7 @@ add_task(async function test_uncheck_never_translate_site_shows_button() {
     { checked: true }
   );
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     openFromAppMenu: true,
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
   });
@@ -80,7 +80,7 @@ add_task(
       runInPage
     );
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewRevisit,
     });
     await FullPageTranslationsTestUtils.openTranslationsSettingsMenu();
@@ -105,7 +105,7 @@ add_task(
 
     await FullPageTranslationsTestUtils.assertPageIsUntranslated(runInPage);
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       openFromAppMenu: true,
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
     });
diff --git a/browser/components/translations/tests/browser/browser_translations_panel_auto_translate_error_view.js b/browser/components/translations/tests/browser/browser_translations_full_page_panel_auto_translate_error_view.js
index e71ee1392b..9470133dd0 100644
--- a/browser/components/translations/tests/browser/browser_translations_panel_auto_translate_error_view.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_panel_auto_translate_error_view.js
@@ -34,7 +34,7 @@ add_task(
       "The translations button is visible."
     );
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
     });
     await FullPageTranslationsTestUtils.openTranslationsSettingsMenu();
@@ -64,14 +64,14 @@ add_task(
       "The translations button should be unavailable."
     );
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       openFromAppMenu: true,
       onOpenPanel:
         FullPageTranslationsTestUtils.assertPanelViewUnsupportedLanguage,
     });
 
     info("Destroy the engine process so that an error will happen.");
-    await TranslationsParent.destroyEngineProcess();
+    await EngineProcess.destroyTranslationsEngine();
 
     await navigate("Navigate back to a Spanish page.", {
       url: SPANISH_PAGE_URL_DOT_ORG,
diff --git a/browser/components/translations/tests/browser/browser_translations_panel_auto_translate_revisit_view.js b/browser/components/translations/tests/browser/browser_translations_full_page_panel_auto_translate_revisit_view.js
index dd4ffcecfd..f898300038 100644
--- a/browser/components/translations/tests/browser/browser_translations_panel_auto_translate_revisit_view.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_panel_auto_translate_revisit_view.js
@@ -29,7 +29,7 @@ add_task(
       "The translations button is visible."
     );
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
     });
     await FullPageTranslationsTestUtils.openTranslationsSettingsMenu();
@@ -59,7 +59,7 @@ add_task(
       "The translations button should be unavailable."
     );
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       openFromAppMenu: true,
       onOpenPanel:
         FullPageTranslationsTestUtils.assertPanelViewUnsupportedLanguage,
@@ -76,7 +76,7 @@ add_task(
       runInPage
     );
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       openFromAppMenu: true,
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewRevisit,
     });
diff --git a/browser/components/translations/tests/browser/browser_translations_panel_basics.js b/browser/components/translations/tests/browser/browser_translations_full_page_panel_basics.js
index ef2e2c4708..30880553f0 100644
--- a/browser/components/translations/tests/browser/browser_translations_panel_basics.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_panel_basics.js
@@ -22,11 +22,11 @@ add_task(async function test_translations_panel_basics() {
 
   await FullPageTranslationsTestUtils.assertPageIsUntranslated(runInPage);
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
   });
 
-  const panel = document.getElementById("translations-panel");
+  const panel = document.getElementById("full-page-translations-panel");
   const label = document.getElementById(panel.getAttribute("aria-labelledby"));
   ok(label, "The a11y label for the panel can be found.");
   assertVisibility({ visible: { label } });
@@ -38,7 +38,7 @@ add_task(async function test_translations_panel_basics() {
     "The icon presents the loading indicator."
   );
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewLoading,
   });
 
@@ -52,7 +52,7 @@ add_task(async function test_translations_panel_basics() {
     runInPage
   );
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewRevisit,
   });
 
diff --git a/browser/components/translations/tests/browser/browser_translations_panel_button.js b/browser/components/translations/tests/browser/browser_translations_full_page_panel_button.js
index 209cfc18a6..209cfc18a6 100644
--- a/browser/components/translations/tests/browser/browser_translations_panel_button.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_panel_button.js
diff --git a/browser/components/translations/tests/browser/browser_translations_panel_cancel.js b/browser/components/translations/tests/browser/browser_translations_full_page_panel_cancel.js
index 17e680dd87..9a0a3ebccb 100644
--- a/browser/components/translations/tests/browser/browser_translations_panel_cancel.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_panel_cancel.js
@@ -17,7 +17,7 @@ add_task(async function test_translations_panel_cancel() {
     "The button is available."
   );
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
   });
 
diff --git a/browser/components/translations/tests/browser/browser_translations_panel_close_panel_never_translate_language_with_translations_active.js b/browser/components/translations/tests/browser/browser_translations_full_page_panel_close_panel_never_translate_language_with_translations_active.js
index 0fbffd891a..e76c771ed9 100644
--- a/browser/components/translations/tests/browser/browser_translations_panel_close_panel_never_translate_language_with_translations_active.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_panel_close_panel_never_translate_language_with_translations_active.js
@@ -17,7 +17,7 @@ add_task(
       "The translations button is available"
     );
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       openFromAppMenu: true,
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
     });
@@ -39,7 +39,7 @@ add_task(
       "The page should be automatically translated."
     );
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewRevisit,
     });
     await FullPageTranslationsTestUtils.openTranslationsSettingsMenu();
@@ -49,7 +49,7 @@ add_task(
     await FullPageTranslationsTestUtils.assertIsNeverTranslateLanguage("es", {
       checked: false,
     });
-    await FullPageTranslationsTestUtils.waitForTranslationsPopupEvent(
+    await FullPageTranslationsTestUtils.waitForPanelPopupEvent(
       "popuphidden",
       async () => {
         await FullPageTranslationsTestUtils.clickNeverTranslateLanguage();
@@ -79,7 +79,7 @@ add_task(
       "The translations button is available"
     );
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       openFromAppMenu: true,
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
     });
@@ -101,7 +101,7 @@ add_task(
       "The page should be automatically translated."
     );
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewRevisit,
     });
     await FullPageTranslationsTestUtils.openTranslationsSettingsMenu();
@@ -119,7 +119,7 @@ add_task(
     );
     await FullPageTranslationsTestUtils.assertPageIsUntranslated(runInPage);
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       openFromAppMenu: true,
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
     });
@@ -136,7 +136,7 @@ add_task(
     await FullPageTranslationsTestUtils.assertIsNeverTranslateLanguage("es", {
       checked: false,
     });
-    await FullPageTranslationsTestUtils.waitForTranslationsPopupEvent(
+    await FullPageTranslationsTestUtils.waitForPanelPopupEvent(
       "popuphidden",
       async () => {
         await FullPageTranslationsTestUtils.clickNeverTranslateLanguage();
diff --git a/browser/components/translations/tests/browser/browser_translations_panel_close_panel_never_translate_language_with_translations_inactive.js b/browser/components/translations/tests/browser/browser_translations_full_page_panel_close_panel_never_translate_language_with_translations_inactive.js
index 5df2468646..95ff86ba7f 100644
--- a/browser/components/translations/tests/browser/browser_translations_panel_close_panel_never_translate_language_with_translations_inactive.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_panel_close_panel_never_translate_language_with_translations_inactive.js
@@ -16,7 +16,7 @@ add_task(async function test_panel_closes_on_toggle_never_translate_language() {
     "The translations button is available"
   );
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     openFromAppMenu: true,
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
   });
@@ -26,7 +26,7 @@ add_task(async function test_panel_closes_on_toggle_never_translate_language() {
   await FullPageTranslationsTestUtils.assertIsNeverTranslateLanguage("es", {
     checked: false,
   });
-  await FullPageTranslationsTestUtils.waitForTranslationsPopupEvent(
+  await FullPageTranslationsTestUtils.waitForPanelPopupEvent(
     "popuphidden",
     async () => {
       await FullPageTranslationsTestUtils.clickNeverTranslateLanguage();
@@ -52,7 +52,7 @@ add_task(
       "The translations button is available"
     );
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       openFromAppMenu: true,
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
     });
@@ -69,7 +69,7 @@ add_task(
       { checked: true }
     );
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       openFromAppMenu: true,
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
     });
@@ -82,7 +82,7 @@ add_task(
     await FullPageTranslationsTestUtils.assertIsNeverTranslateLanguage("es", {
       checked: false,
     });
-    await FullPageTranslationsTestUtils.waitForTranslationsPopupEvent(
+    await FullPageTranslationsTestUtils.waitForPanelPopupEvent(
       "popuphidden",
       async () => {
         await FullPageTranslationsTestUtils.clickNeverTranslateLanguage();
diff --git a/browser/components/translations/tests/browser/browser_translations_panel_close_panel_never_translate_site.js b/browser/components/translations/tests/browser/browser_translations_full_page_panel_close_panel_never_translate_site.js
index 78679a046a..c3d1458525 100644
--- a/browser/components/translations/tests/browser/browser_translations_panel_close_panel_never_translate_site.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_panel_close_panel_never_translate_site.js
@@ -16,7 +16,7 @@ add_task(async function test_panel_closes_on_toggle_never_translate_site() {
     "The translations button is available"
   );
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     openFromAppMenu: true,
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
   });
@@ -27,7 +27,7 @@ add_task(async function test_panel_closes_on_toggle_never_translate_site() {
     SPANISH_PAGE_URL,
     { checked: false }
   );
-  await FullPageTranslationsTestUtils.waitForTranslationsPopupEvent(
+  await FullPageTranslationsTestUtils.waitForPanelPopupEvent(
     "popuphidden",
     async () => {
       await FullPageTranslationsTestUtils.clickNeverTranslateSite();
@@ -54,7 +54,7 @@ add_task(
       "The translations button is available"
     );
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       openFromAppMenu: true,
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
     });
@@ -78,7 +78,7 @@ add_task(
       "The page should be automatically translated."
     );
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewRevisit,
     });
     await FullPageTranslationsTestUtils.openTranslationsSettingsMenu();
@@ -91,7 +91,7 @@ add_task(
       { checked: false }
     );
 
-    await FullPageTranslationsTestUtils.waitForTranslationsPopupEvent(
+    await FullPageTranslationsTestUtils.waitForPanelPopupEvent(
       "popuphidden",
       async () => {
         await FullPageTranslationsTestUtils.clickNeverTranslateSite();
@@ -119,7 +119,7 @@ add_task(
       "The translations button is available"
     );
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       openFromAppMenu: true,
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
     });
@@ -134,7 +134,7 @@ add_task(
       checked: true,
     });
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       openFromAppMenu: true,
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
     });
@@ -147,7 +147,7 @@ add_task(
       SPANISH_PAGE_URL,
       { checked: false }
     );
-    await FullPageTranslationsTestUtils.waitForTranslationsPopupEvent(
+    await FullPageTranslationsTestUtils.waitForPanelPopupEvent(
       "popuphidden",
       async () => {
         await FullPageTranslationsTestUtils.clickNeverTranslateSite();
diff --git a/browser/components/translations/tests/browser/browser_translations_panel_engine_destroy.js b/browser/components/translations/tests/browser/browser_translations_full_page_panel_engine_destroy.js
index 0a58dd7fa6..1b498f9b07 100644
--- a/browser/components/translations/tests/browser/browser_translations_panel_engine_destroy.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_panel_engine_destroy.js
@@ -16,7 +16,7 @@ add_task(async function test_translations_engine_destroy() {
     { button: true },
     "The button is available."
   );
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
   });
 
@@ -31,7 +31,7 @@ add_task(async function test_translations_engine_destroy() {
   );
 
   info("Destroy the engine process");
-  await TranslationsParent.destroyEngineProcess();
+  await EngineProcess.destroyTranslationsEngine();
 
   info("Mutate the page's content to re-trigger a translation.");
   await runInPage(async TranslationsTest => {
diff --git a/browser/components/translations/tests/browser/browser_translations_panel_engine_destroy_pending.js b/browser/components/translations/tests/browser/browser_translations_full_page_panel_engine_destroy_pending.js
index ace1a845df..cfe1997093 100644
--- a/browser/components/translations/tests/browser/browser_translations_panel_engine_destroy_pending.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_panel_engine_destroy_pending.js
@@ -22,7 +22,7 @@ add_task(async function test_translations_engine_destroy_pending() {
     { button: true },
     "The button is available."
   );
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
   });
 
@@ -42,7 +42,7 @@ add_task(async function test_translations_engine_destroy_pending() {
   );
 
   info("Destroy the engine process");
-  await TranslationsParent.destroyEngineProcess();
+  await EngineProcess.destroyTranslationsEngine();
 
   info("Mutate the page's content to re-trigger a translation.");
   await runInPage(async TranslationsTest => {
diff --git a/browser/components/translations/tests/browser/browser_translations_panel_engine_unsupported.js b/browser/components/translations/tests/browser/browser_translations_full_page_panel_engine_unsupported.js
index f0804f35aa..f0804f35aa 100644
--- a/browser/components/translations/tests/browser/browser_translations_panel_engine_unsupported.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_panel_engine_unsupported.js
diff --git a/browser/components/translations/tests/browser/browser_translations_panel_engine_unsupported_lang.js b/browser/components/translations/tests/browser/browser_translations_full_page_panel_engine_unsupported_lang.js
index 79e5c6b119..21f7e8fdb7 100644
--- a/browser/components/translations/tests/browser/browser_translations_panel_engine_unsupported_lang.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_panel_engine_unsupported_lang.js
@@ -16,7 +16,7 @@ add_task(async function test_unsupported_lang() {
     ],
   });
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     openFromAppMenu: true,
     onOpenPanel:
       FullPageTranslationsTestUtils.assertPanelViewUnsupportedLanguage,
diff --git a/browser/components/translations/tests/browser/browser_translations_panel_firstrun.js b/browser/components/translations/tests/browser/browser_translations_full_page_panel_firstrun.js
index 0c248a7837..ef807b9ac6 100644
--- a/browser/components/translations/tests/browser/browser_translations_panel_firstrun.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_panel_firstrun.js
@@ -13,7 +13,7 @@ add_task(async function test_translations_panel_firstrun() {
     prefs: [["browser.translations.panelShown", false]],
   });
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewFirstShow,
   });
 
@@ -23,7 +23,7 @@ add_task(async function test_translations_panel_firstrun() {
     url: SPANISH_PAGE_URL_2,
   });
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
   });
 
diff --git a/browser/components/translations/tests/browser/browser_translations_panel_firstrun_revisit.js b/browser/components/translations/tests/browser/browser_translations_full_page_panel_firstrun_revisit.js
index 02c2d94db9..998a7653c8 100644
--- a/browser/components/translations/tests/browser/browser_translations_panel_firstrun_revisit.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_panel_firstrun_revisit.js
@@ -21,13 +21,13 @@ add_task(async function test_translations_panel_firstrun() {
     "The button is available."
   );
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewFirstShow,
   });
 
   await FullPageTranslationsTestUtils.clickCancelButton();
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewFirstShow,
   });
 
@@ -37,7 +37,7 @@ add_task(async function test_translations_panel_firstrun() {
     url: SPANISH_PAGE_URL_DOT_ORG,
   });
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
   });
 
@@ -47,7 +47,7 @@ add_task(async function test_translations_panel_firstrun() {
     url: SPANISH_PAGE_URL,
   });
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
   });
 
diff --git a/browser/components/translations/tests/browser/browser_translations_panel_fuzzing.js b/browser/components/translations/tests/browser/browser_translations_full_page_panel_fuzzing.js
index 2f5285ac46..0accc3db60 100644
--- a/browser/components/translations/tests/browser/browser_translations_panel_fuzzing.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_panel_fuzzing.js
@@ -96,7 +96,7 @@ add_task(async function test_translations_panel_fuzzing() {
           { button: true },
           "The button is available."
         );
-        await FullPageTranslationsTestUtils.openTranslationsPanel({
+        await FullPageTranslationsTestUtils.openPanel({
           onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
         });
 
@@ -131,7 +131,7 @@ add_task(async function test_translations_panel_fuzzing() {
         hasVerifiedMutation
       ) {
         reportOperation("destroyEngineProcess");
-        await TranslationsParent.destroyEngineProcess();
+        await EngineProcess.destroyTranslationsEngine();
         isEngineMaybeDestroyed = true;
       }
       return true;
@@ -195,7 +195,7 @@ add_task(async function test_translations_panel_fuzzing() {
     async restoreSpanishPage() {
       if (activeTab === "spanish" && isSpanishPageTranslated) {
         reportOperation("restoreSpanishPage");
-        await FullPageTranslationsTestUtils.openTranslationsPanel({
+        await FullPageTranslationsTestUtils.openPanel({
           onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewRevisit,
         });
 
diff --git a/browser/components/translations/tests/browser/browser_translations_panel_gear.js b/browser/components/translations/tests/browser/browser_translations_full_page_panel_gear.js
index c24fc61e3d..0b9ce3ad3b 100644
--- a/browser/components/translations/tests/browser/browser_translations_panel_gear.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_panel_gear.js
@@ -12,7 +12,7 @@ add_task(async function test_translations_panel_manage_languages() {
     languagePairs: LANGUAGE_PAIRS,
   });
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
   });
 
diff --git a/browser/components/translations/tests/browser/browser_translations_panel_never_translate_language.js b/browser/components/translations/tests/browser/browser_translations_full_page_panel_never_translate_language.js
index 6c1fea7754..52cab172e7 100644
--- a/browser/components/translations/tests/browser/browser_translations_panel_never_translate_language.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_panel_never_translate_language.js
@@ -21,7 +21,7 @@ add_task(async function test_toggle_never_translate_language_menuitem() {
 
   await FullPageTranslationsTestUtils.assertPageIsUntranslated(runInPage);
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
   });
   await FullPageTranslationsTestUtils.openTranslationsSettingsMenu();
@@ -69,7 +69,7 @@ add_task(
 
     await FullPageTranslationsTestUtils.assertPageIsUntranslated(runInPage);
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
     });
 
@@ -83,7 +83,7 @@ add_task(
       runInPage
     );
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewRevisit,
     });
     await FullPageTranslationsTestUtils.openTranslationsSettingsMenu();
@@ -125,7 +125,7 @@ add_task(
       "The button is available."
     );
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
     });
     await FullPageTranslationsTestUtils.openTranslationsSettingsMenu();
@@ -154,7 +154,7 @@ add_task(
       runInPage
     );
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewRevisit,
     });
     await FullPageTranslationsTestUtils.openTranslationsSettingsMenu();
diff --git a/browser/components/translations/tests/browser/browser_translations_panel_never_translate_site.js b/browser/components/translations/tests/browser/browser_translations_full_page_panel_never_translate_site.js
index 858aa297df..9d64da5b38 100644
--- a/browser/components/translations/tests/browser/browser_translations_panel_never_translate_site.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_panel_never_translate_site.js
@@ -22,7 +22,7 @@ add_task(async function test_toggle_never_translate_site_menuitem() {
 
   await FullPageTranslationsTestUtils.assertPageIsUntranslated(runInPage);
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
   });
   await FullPageTranslationsTestUtils.openTranslationsSettingsMenu();
@@ -82,7 +82,7 @@ add_task(
 
     await FullPageTranslationsTestUtils.assertPageIsUntranslated(runInPage);
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
     });
 
@@ -96,7 +96,7 @@ add_task(
       runInPage
     );
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewRevisit,
     });
     await FullPageTranslationsTestUtils.openTranslationsSettingsMenu();
@@ -161,7 +161,7 @@ add_task(
       "The button is available."
     );
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
     });
     await FullPageTranslationsTestUtils.openTranslationsSettingsMenu();
@@ -192,7 +192,7 @@ add_task(
       runInPage
     );
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewRevisit,
     });
     await FullPageTranslationsTestUtils.openTranslationsSettingsMenu();
diff --git a/browser/components/translations/tests/browser/browser_translations_panel_never_translate_site_auto.js b/browser/components/translations/tests/browser/browser_translations_full_page_panel_never_translate_site_auto.js
index 28f3b570c3..faa425c403 100644
--- a/browser/components/translations/tests/browser/browser_translations_panel_never_translate_site_auto.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_panel_never_translate_site_auto.js
@@ -23,7 +23,7 @@ add_task(
       "The button is available."
     );
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
     });
     await FullPageTranslationsTestUtils.openTranslationsSettingsMenu();
@@ -54,7 +54,7 @@ add_task(
       runInPage
     );
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewRevisit,
     });
     await FullPageTranslationsTestUtils.openTranslationsSettingsMenu();
diff --git a/browser/components/translations/tests/browser/browser_translations_panel_never_translate_site_basic.js b/browser/components/translations/tests/browser/browser_translations_full_page_panel_never_translate_site_basic.js
index 098ff54d6e..048e002f45 100644
--- a/browser/components/translations/tests/browser/browser_translations_panel_never_translate_site_basic.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_panel_never_translate_site_basic.js
@@ -22,7 +22,7 @@ add_task(async function test_toggle_never_translate_site_menuitem() {
 
   await FullPageTranslationsTestUtils.assertPageIsUntranslated(runInPage);
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
   });
   await FullPageTranslationsTestUtils.openTranslationsSettingsMenu();
diff --git a/browser/components/translations/tests/browser/browser_translations_panel_never_translate_site_manual.js b/browser/components/translations/tests/browser/browser_translations_full_page_panel_never_translate_site_manual.js
index d916342c33..425e202546 100644
--- a/browser/components/translations/tests/browser/browser_translations_panel_never_translate_site_manual.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_panel_never_translate_site_manual.js
@@ -24,7 +24,7 @@ add_task(
 
     await FullPageTranslationsTestUtils.assertPageIsUntranslated(runInPage);
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
     });
 
@@ -38,7 +38,7 @@ add_task(
       runInPage
     );
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewRevisit,
     });
     await FullPageTranslationsTestUtils.openTranslationsSettingsMenu();
diff --git a/browser/components/translations/tests/browser/browser_translations_panel_retry.js b/browser/components/translations/tests/browser/browser_translations_full_page_panel_retry.js
index 76a6bd9429..74d92381b9 100644
--- a/browser/components/translations/tests/browser/browser_translations_panel_retry.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_panel_retry.js
@@ -19,7 +19,7 @@ add_task(async function test_translations_panel_retry() {
 
   await FullPageTranslationsTestUtils.assertPageIsUntranslated(runInPage);
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
   });
 
@@ -33,7 +33,7 @@ add_task(async function test_translations_panel_retry() {
     runInPage
   );
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewRevisit,
   });
 
diff --git a/browser/components/translations/tests/browser/browser_translations_panel_settings_unsupported_lang.js b/browser/components/translations/tests/browser/browser_translations_full_page_panel_settings_unsupported_lang.js
index 18fcf484dd..d371e9ed22 100644
--- a/browser/components/translations/tests/browser/browser_translations_panel_settings_unsupported_lang.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_panel_settings_unsupported_lang.js
@@ -26,7 +26,7 @@ add_task(async function test_unsupported_language_settings_menu_checkboxes() {
     "The translations button is visible."
   );
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
   });
   await FullPageTranslationsTestUtils.openTranslationsSettingsMenu();
@@ -56,7 +56,7 @@ add_task(async function test_unsupported_language_settings_menu_checkboxes() {
     "The translations button should be unavailable."
   );
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     openFromAppMenu: true,
     onOpenPanel:
       FullPageTranslationsTestUtils.assertPanelViewUnsupportedLanguage,
diff --git a/browser/components/translations/tests/browser/browser_translations_panel_switch_languages.js b/browser/components/translations/tests/browser/browser_translations_full_page_panel_switch_languages.js
index 3652c61d83..0c5db67b20 100644
--- a/browser/components/translations/tests/browser/browser_translations_panel_switch_languages.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_panel_switch_languages.js
@@ -19,16 +19,16 @@ add_task(async function test_translations_panel_switch_language() {
 
   await FullPageTranslationsTestUtils.assertPageIsUntranslated(runInPage);
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
   });
 
-  const { translateButton } = TranslationsPanel.elements;
+  const { translateButton } = FullPageTranslationsPanel.elements;
 
   ok(!translateButton.disabled, "The translate button starts as enabled");
 
-  FullPageTranslationsTestUtils.assertSelectedFromLanguage("es");
-  FullPageTranslationsTestUtils.assertSelectedToLanguage("en");
+  FullPageTranslationsTestUtils.assertSelectedFromLanguage({ langTag: "es" });
+  FullPageTranslationsTestUtils.assertSelectedToLanguage({ langTag: "en" });
 
   FullPageTranslationsTestUtils.switchSelectedFromLanguage("en");
 
diff --git a/browser/components/translations/tests/browser/browser_translations_reader_mode.js b/browser/components/translations/tests/browser/browser_translations_full_page_reader_mode.js
index d066257998..1a6ea9d2ec 100644
--- a/browser/components/translations/tests/browser/browser_translations_reader_mode.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_reader_mode.js
@@ -72,7 +72,7 @@ add_task(async function test_translations_persist_in_reader_mode() {
 
   await FullPageTranslationsTestUtils.assertPageIsUntranslated(runInPage);
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
   });
 
diff --git a/browser/components/translations/tests/browser/browser_translations_telemetry_firstrun_auto_translate.js b/browser/components/translations/tests/browser/browser_translations_full_page_telemetry_firstrun_auto_translate.js
index abfc3dc32e..d26bcad77b 100644
--- a/browser/components/translations/tests/browser/browser_translations_telemetry_firstrun_auto_translate.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_telemetry_firstrun_auto_translate.js
@@ -21,7 +21,7 @@ add_task(async function test_translations_telemetry_firstrun_auto_translate() {
 
   await FullPageTranslationsTestUtils.assertPageIsUntranslated(runInPage);
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewFirstShow,
   });
   await FullPageTranslationsTestUtils.openTranslationsSettingsMenu();
@@ -74,7 +74,7 @@ add_task(async function test_translations_telemetry_firstrun_auto_translate() {
     }
   );
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewRevisit,
   });
 
diff --git a/browser/components/translations/tests/browser/browser_translations_telemetry_firstrun_basics.js b/browser/components/translations/tests/browser/browser_translations_full_page_telemetry_firstrun_basics.js
index 200e06b9ce..db6d2e3b6c 100644
--- a/browser/components/translations/tests/browser/browser_translations_telemetry_firstrun_basics.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_telemetry_firstrun_basics.js
@@ -23,7 +23,7 @@ add_task(async function test_translations_telemetry_firstrun_basics() {
     "The button is available."
   );
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewFirstShow,
   });
 
@@ -56,7 +56,7 @@ add_task(async function test_translations_telemetry_firstrun_basics() {
     expectFirstInteraction: true,
   });
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewFirstShow,
   });
 
diff --git a/browser/components/translations/tests/browser/browser_translations_telemetry_firstrun_translation_failure.js b/browser/components/translations/tests/browser/browser_translations_full_page_telemetry_firstrun_translation_failure.js
index 5397175039..75f58ab229 100644
--- a/browser/components/translations/tests/browser/browser_translations_telemetry_firstrun_translation_failure.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_telemetry_firstrun_translation_failure.js
@@ -25,7 +25,7 @@ add_task(async function test_translations_telemetry_firstrun_failure() {
 
   await FullPageTranslationsTestUtils.assertPageIsUntranslated(runInPage);
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewFirstShow,
   });
 
@@ -113,7 +113,7 @@ add_task(async function test_translations_telemetry_firstrun_failure() {
     expectFirstInteraction: true,
   });
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewFirstShow,
   });
 
diff --git a/browser/components/translations/tests/browser/browser_translations_telemetry_firstrun_unsupported_lang.js b/browser/components/translations/tests/browser/browser_translations_full_page_telemetry_firstrun_unsupported_lang.js
index fa9c67ee37..86ae21e9ed 100644
--- a/browser/components/translations/tests/browser/browser_translations_telemetry_firstrun_unsupported_lang.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_telemetry_firstrun_unsupported_lang.js
@@ -19,7 +19,7 @@ add_task(
       prefs: [["browser.translations.panelShown", false]],
     });
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       openFromAppMenu: true,
       onOpenPanel:
         FullPageTranslationsTestUtils.assertPanelViewUnsupportedLanguage,
@@ -83,7 +83,7 @@ add_task(
       expectFirstInteraction: true,
     });
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       openFromAppMenu: true,
       onOpenPanel:
         FullPageTranslationsTestUtils.assertPanelViewUnsupportedLanguage,
diff --git a/browser/components/translations/tests/browser/browser_translations_telemetry_open_panel.js b/browser/components/translations/tests/browser/browser_translations_full_page_telemetry_open_panel.js
index 64a02287e8..a49059f78f 100644
--- a/browser/components/translations/tests/browser/browser_translations_telemetry_open_panel.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_telemetry_open_panel.js
@@ -21,7 +21,7 @@ add_task(async function test_translations_telemetry_open_panel() {
     "The button is available."
   );
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
   });
 
@@ -51,7 +51,7 @@ add_task(async function test_translations_telemetry_open_panel() {
     expectNewFlowId: false,
   });
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
   });
 
diff --git a/browser/components/translations/tests/browser/browser_translations_telemetry_panel_auto_offer.js b/browser/components/translations/tests/browser/browser_translations_full_page_telemetry_panel_auto_offer.js
index 93ff473851..93ff473851 100644
--- a/browser/components/translations/tests/browser/browser_translations_telemetry_panel_auto_offer.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_telemetry_panel_auto_offer.js
diff --git a/browser/components/translations/tests/browser/browser_translations_telemetry_panel_auto_offer_settings.js b/browser/components/translations/tests/browser/browser_translations_full_page_telemetry_panel_auto_offer_settings.js
index 9eae81904d..4a2959f58e 100644
--- a/browser/components/translations/tests/browser/browser_translations_telemetry_panel_auto_offer_settings.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_telemetry_panel_auto_offer_settings.js
@@ -24,7 +24,7 @@ add_task(async function test_translations_panel_auto_offer_settings() {
     expectedEventCount: 0,
   });
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
   });
   await FullPageTranslationsTestUtils.openTranslationsSettingsMenu();
@@ -54,7 +54,7 @@ add_task(async function test_translations_panel_auto_offer_settings() {
     }
   );
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
   });
   await FullPageTranslationsTestUtils.assertIsAlwaysOfferTranslationsEnabled(
diff --git a/browser/components/translations/tests/browser/browser_translations_telemetry_switch_languages.js b/browser/components/translations/tests/browser/browser_translations_full_page_telemetry_switch_languages.js
index 6c06abab95..ef13940b3f 100644
--- a/browser/components/translations/tests/browser/browser_translations_telemetry_switch_languages.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_telemetry_switch_languages.js
@@ -19,11 +19,11 @@ add_task(async function test_translations_telemetry_switch_from_language() {
 
   await FullPageTranslationsTestUtils.assertPageIsUntranslated(runInPage);
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
   });
 
-  FullPageTranslationsTestUtils.assertSelectedFromLanguage("es");
+  FullPageTranslationsTestUtils.assertSelectedFromLanguage({ langTag: "es" });
   FullPageTranslationsTestUtils.switchSelectedFromLanguage("en");
 
   await TestTranslationsTelemetry.assertEvent(Glean.translationsPanel.open, {
@@ -95,11 +95,11 @@ add_task(async function test_translations_telemetry_switch_to_language() {
 
   await FullPageTranslationsTestUtils.assertPageIsUntranslated(runInPage);
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
   });
 
-  FullPageTranslationsTestUtils.assertSelectedToLanguage("en");
+  FullPageTranslationsTestUtils.assertSelectedToLanguage({ langTag: "en" });
   FullPageTranslationsTestUtils.switchSelectedToLanguage("fr");
 
   await TestTranslationsTelemetry.assertEvent(Glean.translationsPanel.open, {
diff --git a/browser/components/translations/tests/browser/browser_translations_telemetry_translation_failure.js b/browser/components/translations/tests/browser/browser_translations_full_page_telemetry_translation_failure.js
index e7d0cfb4f4..7a9f58970a 100644
--- a/browser/components/translations/tests/browser/browser_translations_telemetry_translation_failure.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_telemetry_translation_failure.js
@@ -44,7 +44,7 @@ add_task(
       }
     );
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
     });
 
diff --git a/browser/components/translations/tests/browser/browser_translations_telemetry_translation_request.js b/browser/components/translations/tests/browser/browser_translations_full_page_telemetry_translation_request.js
index 90bd81a8ed..e671f5e0da 100644
--- a/browser/components/translations/tests/browser/browser_translations_telemetry_translation_request.js
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_telemetry_translation_request.js
@@ -39,7 +39,7 @@ add_task(async function test_translations_telemetry_manual_translation() {
     }
   );
 
-  await FullPageTranslationsTestUtils.openTranslationsPanel({
+  await FullPageTranslationsTestUtils.openPanel({
     onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
   });
 
diff --git a/browser/components/translations/tests/browser/browser_translations_select_context_menu_with_full_page_translations_active.js b/browser/components/translations/tests/browser/browser_translations_select_context_menu_with_full_page_translations_active.js
index 58cb655e38..99cff2b4ec 100644
--- a/browser/components/translations/tests/browser/browser_translations_select_context_menu_with_full_page_translations_active.js
+++ b/browser/components/translations/tests/browser/browser_translations_select_context_menu_with_full_page_translations_active.js
@@ -35,7 +35,7 @@ add_task(
       "The translate-selection context menu item should be available while full-page translations is inactive."
     );
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
     });
 
@@ -59,7 +59,7 @@ add_task(
       "The translate-selection context menu item should be unavailable while full-page translations is active."
     );
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewRevisit,
     });
 
@@ -114,7 +114,7 @@ add_task(
       "The translate-selection context menu item should be available while full-page translations is inactive."
     );
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
     });
 
@@ -138,7 +138,7 @@ add_task(
       "The translate-selection context menu item should be unavailable while full-page translations is active."
     );
 
-    await FullPageTranslationsTestUtils.openTranslationsPanel({
+    await FullPageTranslationsTestUtils.openPanel({
       onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewRevisit,
     });
 
diff --git a/browser/components/translations/tests/browser/browser_translations_select_panel_language_selectors.js b/browser/components/translations/tests/browser/browser_translations_select_panel_language_selectors.js
new file mode 100644
index 0000000000..1dcc76450f
--- /dev/null
+++ b/browser/components/translations/tests/browser/browser_translations_select_panel_language_selectors.js
@@ -0,0 +1,54 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(
+  async function test_select_translations_panel_open_spanish_language_selectors() {
+    const { cleanup, runInPage } = await loadTestPage({
+      page: SPANISH_PAGE_URL,
+      languagePairs: LANGUAGE_PAIRS,
+      prefs: [["browser.translations.select.enable", true]],
+    });
+
+    await SelectTranslationsTestUtils.openPanel(runInPage, {
+      selectSpanishParagraph: true,
+      openAtSpanishParagraph: true,
+      expectedTargetLanguage: "en",
+      onOpenPanel: SelectTranslationsTestUtils.assertPanelViewDefault,
+    });
+
+    SelectTranslationsTestUtils.assertSelectedFromLanguage({ langTag: "es" });
+    SelectTranslationsTestUtils.assertSelectedToLanguage({ langTag: "en" });
+
+    await SelectTranslationsTestUtils.clickDoneButton();
+
+    await cleanup();
+  }
+);
+
+add_task(
+  async function test_select_translations_panel_open_english_language_selectors() {
+    const { cleanup, runInPage } = await loadTestPage({
+      page: ENGLISH_PAGE_URL,
+      languagePairs: LANGUAGE_PAIRS,
+      prefs: [["browser.translations.select.enable", true]],
+    });
+
+    await SelectTranslationsTestUtils.openPanel(runInPage, {
+      selectFirstParagraph: true,
+      openAtFirstParagraph: true,
+      expectedTargetLanguage: "en",
+      onOpenPanel: SelectTranslationsTestUtils.assertPanelViewDefault,
+    });
+
+    SelectTranslationsTestUtils.assertSelectedFromLanguage({ langTag: "en" });
+    SelectTranslationsTestUtils.assertSelectedToLanguage({
+      l10nId: "translations-panel-choose-language",
+    });
+
+    await SelectTranslationsTestUtils.clickDoneButton();
+
+    await cleanup();
+  }
+);
diff --git a/browser/components/translations/tests/browser/browser_translations_select_panel_mainview_ui.js b/browser/components/translations/tests/browser/browser_translations_select_panel_mainview_ui.js
new file mode 100644
index 0000000000..79d21e57d0
--- /dev/null
+++ b/browser/components/translations/tests/browser/browser_translations_select_panel_mainview_ui.js
@@ -0,0 +1,36 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * This test case verifies the visibility and initial state of UI elements within the
+ * Select Translations Panel's main-view UI.
+ */
+add_task(
+  async function test_select_translations_panel_mainview_ui_element_visibility() {
+    const { cleanup, runInPage } = await loadTestPage({
+      page: SPANISH_PAGE_URL,
+      languagePairs: LANGUAGE_PAIRS,
+      prefs: [["browser.translations.select.enable", true]],
+    });
+
+    await FullPageTranslationsTestUtils.assertTranslationsButton(
+      { button: true, circleArrows: false, locale: false, icon: true },
+      "The button is available."
+    );
+
+    await FullPageTranslationsTestUtils.assertPageIsUntranslated(runInPage);
+
+    await SelectTranslationsTestUtils.openPanel(runInPage, {
+      selectSpanishParagraph: true,
+      openAtSpanishParagraph: true,
+      expectedTargetLanguage: "es",
+      onOpenPanel: SelectTranslationsTestUtils.assertPanelViewDefault,
+    });
+
+    await SelectTranslationsTestUtils.clickDoneButton();
+
+    await cleanup();
+  }
+);
diff --git a/browser/components/translations/tests/browser/head.js b/browser/components/translations/tests/browser/head.js
index bc9968308c..200ed08719 100644
--- a/browser/components/translations/tests/browser/head.js
+++ b/browser/components/translations/tests/browser/head.js
@@ -206,7 +206,7 @@ async function navigate(
   // it doesn't close on navigate the way that it does when it's
   // open from the translations button, so ensure that we always
   // close it when we navigate to a new page.
-  await closeTranslationsPanelIfOpen();
+  await closeAllOpenPanelsAndMenus();
 
   info(message);
 
@@ -230,7 +230,7 @@ async function navigate(
 
   info(`Loading url: "${url}"`);
   if (onOpenPanel) {
-    await FullPageTranslationsTestUtils.waitForTranslationsPopupEvent(
+    await FullPageTranslationsTestUtils.waitForPanelPopupEvent(
       "popupshown",
       loadTargetPage,
       onOpenPanel
@@ -277,6 +277,146 @@ async function toggleReaderMode() {
 }
 
 /**
+ * A collection of shared functionality utilized by
+ * FullPageTranslationsTestUtils and SelectTranslationsTestUtils.
+ *
+ * Using functions from the aforementioned classes is preferred over
+ * using functions from this class directly.
+ */
+class SharedTranslationsTestUtils {
+  /**
+   * Asserts that the mainViewId of the panel matches the given string.
+   *
+   * @param {FullPageTranslationsPanel | SelectTranslationsPanel} panel
+   * @param {string} expectedId - The expected id that mainViewId is set to.
+   */
+  static _assertPanelMainViewId(panel, expectedId) {
+    const mainViewId = panel.elements.multiview.getAttribute("mainViewId");
+    is(
+      mainViewId,
+      expectedId,
+      "The mainViewId should match its expected value"
+    );
+  }
+
+  /**
+   * Asserts that the selected from-language matches the provided arguments.
+   *
+   * @param {FullPageTranslationsPanel | SelectTranslationsPanel} panel
+   *  - The UI component or panel whose selected from-language is being asserted.
+   * @param {object} options - An object containing assertion parameters.
+   * @param {string} [options.langTag] - A BCP-47 language tag.
+   * @param {string} [options.l10nId] - A localization identifier.
+   */
+  static _assertSelectedFromLanguage(panel, { langTag, l10nId }) {
+    const { fromMenuList } = panel.elements;
+    is(
+      fromMenuList.value,
+      langTag,
+      "Expected selected from-language to match the given language tag"
+    );
+    if (l10nId) {
+      is(
+        fromMenuList.getAttribute("data-l10n-id"),
+        l10nId,
+        "Expected selected from-language to match the given l10n id"
+      );
+    }
+  }
+
+  /**
+   * Asserts that the selected to-language matches the provided arguments.
+   *
+   * @param {FullPageTranslationsPanel | SelectTranslationsPanel} panel
+   *  - The UI component or panel whose selected from-language is being asserted.
+   * @param {object} options - An object containing assertion parameters.
+   * @param {string} [options.langTag] - A BCP-47 language tag.
+   * @param {string} [options.l10nId] - A localization identifier.
+   */
+  static _assertSelectedToLanguage(panel, { langTag, l10nId }) {
+    const { toMenuList } = panel.elements;
+    if (langTag) {
+      is(
+        toMenuList.value,
+        langTag,
+        "Expected selected to-language to match the given language tag"
+      );
+    }
+    if (l10nId) {
+      is(
+        toMenuList.getAttribute("data-l10n-id"),
+        l10nId,
+        "Expected selected to-language to match the given l10n id"
+      );
+    }
+  }
+
+  /**
+   * Asserts the visibility of the given elements based on the given expectations.
+   *
+   * @param {object} elements - An object containing the elements to be checked for visibility.
+   * @param {object} expectations - An object where each property corresponds to a property in elements,
+   *                                and its value is a boolean indicating whether the element should
+   *                                be visible (true) or hidden (false).
+   * @throws Throws if elements does not contain a property for each property in expectations.
+   */
+  static _assertPanelElementVisibility(elements, expectations) {
+    const hidden = {};
+    const visible = {};
+
+    for (const propertyName in expectations) {
+      ok(
+        elements.hasOwnProperty(propertyName),
+        `Expected panel elements to have property ${propertyName}`
+      );
+      if (expectations[propertyName]) {
+        visible[propertyName] = elements[propertyName];
+      } else {
+        hidden[propertyName] = elements[propertyName];
+      }
+    }
+
+    assertVisibility({ hidden, visible });
+  }
+
+  /**
+   * Executes the provided callback before waiting for the event and then waits for the given event
+   * to be fired for the element corresponding to the provided elementId.
+   *
+   * Optionally executes a postEventAssertion function once the event occurs.
+   *
+   * @param {string} elementId - The Id of the element to wait for the event on.
+   * @param {string} eventName - The name of the event to wait for.
+   * @param {Function} callback - A callback function to execute immediately before waiting for the event.
+   *                              This is often used to trigger the event on the expected element.
+   * @param {Function|null} [postEventAssertion=null] - An optional callback function to execute after
+   *                                                    the event has occurred.
+   * @throws Throws if the element with the specified `elementId` does not exist.
+   * @returns {Promise<void>}
+   */
+  static async _waitForPopupEvent(
+    elementId,
+    eventName,
+    callback,
+    postEventAssertion = null
+  ) {
+    const element = document.getElementById(elementId);
+    if (!element) {
+      throw new Error("Unable to find the translations panel element.");
+    }
+    const promise = BrowserTestUtils.waitForEvent(element, eventName);
+    await callback();
+    info("Waiting for the translations panel popup to be shown");
+    await promise;
+    if (postEventAssertion) {
+      postEventAssertion();
+    }
+    // Wait a single tick on the event loop.
+    await new Promise(resolve => setTimeout(resolve, 0));
+  }
+}
+
+/**
  * A class containing test utility functions specific to testing full-page translations.
  */
 class FullPageTranslationsTestUtils {
@@ -515,61 +655,45 @@ class FullPageTranslationsTestUtils {
 
   /**
    * Asserts that for each provided expectation, the visible state of the corresponding
-   * element in TranslationsPanel.elements both exists and matches the visibility expectation.
+   * element in FullPageTranslationsPanel.elements both exists and matches the visibility expectation.
    *
    * @param {object} expectations
-   *   A list of expectations for the visibility of any subset of TranslationsPanel.elements
+   *   A list of expectations for the visibility of any subset of FullPageTranslationsPanel.elements
    */
   static #assertPanelElementVisibility(expectations = {}) {
-    // Assume nothing is visible by default, and overwrite them
-    // with any specific expectations provided in the argument.
-    const finalExpectations = {
-      cancelButton: false,
-      changeSourceLanguageButton: false,
-      dismissErrorButton: false,
-      error: false,
-      fromMenuList: false,
-      fromLabel: false,
-      header: false,
-      intro: false,
-      introLearnMoreLink: false,
-      langSelection: false,
-      restoreButton: false,
-      toLabel: false,
-      toMenuList: false,
-      translateButton: false,
-      unsupportedHeader: false,
-      unsupportedHint: false,
-      unsupportedLearnMoreLink: false,
-      ...expectations,
-    };
-
-    const elements = TranslationsPanel.elements;
-    const hidden = {};
-    const visible = {};
-
-    for (const propertyName in finalExpectations) {
-      ok(
-        elements.hasOwnProperty(propertyName),
-        `Expected translations panel elements to have property ${propertyName}`
-      );
-      if (finalExpectations[propertyName]) {
-        visible[propertyName] = elements[propertyName];
-      } else {
-        hidden[propertyName] = elements[propertyName];
+    SharedTranslationsTestUtils._assertPanelElementVisibility(
+      FullPageTranslationsPanel.elements,
+      {
+        cancelButton: false,
+        changeSourceLanguageButton: false,
+        dismissErrorButton: false,
+        error: false,
+        fromMenuList: false,
+        fromLabel: false,
+        header: false,
+        intro: false,
+        introLearnMoreLink: false,
+        langSelection: false,
+        restoreButton: false,
+        toLabel: false,
+        toMenuList: false,
+        translateButton: false,
+        unsupportedHeader: false,
+        unsupportedHint: false,
+        unsupportedLearnMoreLink: false,
+        // Overwrite any of the above defaults with the passed in expectations.
+        ...expectations,
       }
-    }
-
-    assertVisibility({ hidden, visible });
+    );
   }
 
   /**
-   * Asserts that the TranslationsPanel header has the expected l10nId.
+   * Asserts that the FullPageTranslationsPanel header has the expected l10nId.
    *
    * @param {string} l10nId - The expected data-l10n-id of the header.
    */
   static #assertPanelHeaderL10nId(l10nId) {
-    const { header } = TranslationsPanel.elements;
+    const { header } = FullPageTranslationsPanel.elements;
     is(
       header.getAttribute("data-l10n-id"),
       l10nId,
@@ -578,17 +702,28 @@ class FullPageTranslationsTestUtils {
   }
 
   /**
+   * Asserts that the FullPageTranslationsPanel error has the expected l10nId.
+   *
+   * @param {string} l10nId - The expected data-l10n-id of the error.
+   */
+  static #assertPanelErrorL10nId(l10nId) {
+    const { errorMessage } = FullPageTranslationsPanel.elements;
+    is(
+      errorMessage.getAttribute("data-l10n-id"),
+      l10nId,
+      "The translations panel error message should match the expected data-l10n-id"
+    );
+  }
+
+  /**
    * Asserts that the mainViewId of the panel matches the given string.
    *
    * @param {string} expectedId
    */
   static #assertPanelMainViewId(expectedId) {
-    const mainViewId =
-      TranslationsPanel.elements.multiview.getAttribute("mainViewId");
-    is(
-      mainViewId,
-      expectedId,
-      "The full-page Translations panel mainViewId should match its expected value"
+    SharedTranslationsTestUtils._assertPanelMainViewId(
+      FullPageTranslationsPanel,
+      expectedId
     );
   }
 
@@ -598,7 +733,7 @@ class FullPageTranslationsTestUtils {
   static assertPanelViewDefault() {
     info("Checking that the panel shows the default view");
     FullPageTranslationsTestUtils.#assertPanelMainViewId(
-      "translations-panel-view-default"
+      "full-page-translations-panel-view-default"
     );
     FullPageTranslationsTestUtils.#assertPanelElementVisibility({
       ...FullPageTranslationsTestUtils.#defaultViewVisibilityExpectations,
@@ -614,7 +749,7 @@ class FullPageTranslationsTestUtils {
   static assertPanelViewError() {
     info("Checking that the panel shows the error view");
     FullPageTranslationsTestUtils.#assertPanelMainViewId(
-      "translations-panel-view-default"
+      "full-page-translations-panel-view-default"
     );
     FullPageTranslationsTestUtils.#assertPanelElementVisibility({
       error: true,
@@ -623,6 +758,9 @@ class FullPageTranslationsTestUtils {
     FullPageTranslationsTestUtils.#assertPanelHeaderL10nId(
       "translations-panel-header"
     );
+    FullPageTranslationsTestUtils.#assertPanelErrorL10nId(
+      "translations-panel-error-translating"
+    );
   }
 
   /**
@@ -644,7 +782,7 @@ class FullPageTranslationsTestUtils {
   static assertPanelViewFirstShow() {
     info("Checking that the panel shows the first-show view");
     FullPageTranslationsTestUtils.#assertPanelMainViewId(
-      "translations-panel-view-default"
+      "full-page-translations-panel-view-default"
     );
     FullPageTranslationsTestUtils.#assertPanelElementVisibility({
       intro: true,
@@ -662,7 +800,7 @@ class FullPageTranslationsTestUtils {
   static assertPanelViewFirstShowError() {
     info("Checking that the panel shows the first-show error view");
     FullPageTranslationsTestUtils.#assertPanelMainViewId(
-      "translations-panel-view-default"
+      "full-page-translations-panel-view-default"
     );
     FullPageTranslationsTestUtils.#assertPanelElementVisibility({
       error: true,
@@ -681,7 +819,7 @@ class FullPageTranslationsTestUtils {
   static assertPanelViewRevisit() {
     info("Checking that the panel shows the revisit view");
     FullPageTranslationsTestUtils.#assertPanelMainViewId(
-      "translations-panel-view-default"
+      "full-page-translations-panel-view-default"
     );
     FullPageTranslationsTestUtils.#assertPanelElementVisibility({
       header: true,
@@ -702,7 +840,7 @@ class FullPageTranslationsTestUtils {
   static assertPanelViewUnsupportedLanguage() {
     info("Checking that the panel shows the unsupported-language view");
     FullPageTranslationsTestUtils.#assertPanelMainViewId(
-      "translations-panel-view-unsupported-language"
+      "full-page-translations-panel-view-unsupported-language"
     );
     FullPageTranslationsTestUtils.#assertPanelElementVisibility({
       changeSourceLanguageButton: true,
@@ -718,13 +856,10 @@ class FullPageTranslationsTestUtils {
    *
    * @param {string} langTag - A BCP-47 language tag.
    */
-  static assertSelectedFromLanguage(langTag) {
-    info(`Checking that the selected from-language matches ${langTag}`);
-    const { fromMenuList } = TranslationsPanel.elements;
-    is(
-      fromMenuList.value,
-      langTag,
-      "Expected selected from-language to match the given language tag"
+  static assertSelectedFromLanguage({ langTag, l10nId }) {
+    SharedTranslationsTestUtils._assertSelectedFromLanguage(
+      FullPageTranslationsPanel,
+      { langTag, l10nId }
     );
   }
 
@@ -733,13 +868,10 @@ class FullPageTranslationsTestUtils {
    *
    * @param {string} langTag - A BCP-47 language tag.
    */
-  static assertSelectedToLanguage(langTag) {
-    info(`Checking that the selected to-language matches ${langTag}`);
-    const { toMenuList } = TranslationsPanel.elements;
-    is(
-      toMenuList.value,
-      langTag,
-      "Expected selected to-language to match the given language tag"
+  static assertSelectedToLanguage({ langTag, l10nId }) {
+    SharedTranslationsTestUtils._assertSelectedToLanguage(
+      FullPageTranslationsPanel,
+      { langTag, l10nId }
     );
   }
 
@@ -827,9 +959,9 @@ class FullPageTranslationsTestUtils {
    */
   static async clickCancelButton() {
     logAction();
-    const { cancelButton } = TranslationsPanel.elements;
+    const { cancelButton } = FullPageTranslationsPanel.elements;
     assertVisibility({ visible: { cancelButton } });
-    await FullPageTranslationsTestUtils.waitForTranslationsPopupEvent(
+    await FullPageTranslationsTestUtils.waitForPanelPopupEvent(
       "popuphidden",
       () => {
         click(cancelButton, "Clicking the cancel button");
@@ -847,9 +979,9 @@ class FullPageTranslationsTestUtils {
    */
   static async clickChangeSourceLanguageButton({ firstShow = false } = {}) {
     logAction();
-    const { changeSourceLanguageButton } = TranslationsPanel.elements;
+    const { changeSourceLanguageButton } = FullPageTranslationsPanel.elements;
     assertVisibility({ visible: { changeSourceLanguageButton } });
-    await FullPageTranslationsTestUtils.waitForTranslationsPopupEvent(
+    await FullPageTranslationsTestUtils.waitForPanelPopupEvent(
       "popupshown",
       () => {
         click(
@@ -868,9 +1000,9 @@ class FullPageTranslationsTestUtils {
    */
   static async clickDismissErrorButton() {
     logAction();
-    const { dismissErrorButton } = TranslationsPanel.elements;
+    const { dismissErrorButton } = FullPageTranslationsPanel.elements;
     assertVisibility({ visible: { dismissErrorButton } });
-    await FullPageTranslationsTestUtils.waitForTranslationsPopupEvent(
+    await FullPageTranslationsTestUtils.waitForPanelPopupEvent(
       "popuphidden",
       () => {
         click(dismissErrorButton, "Click the dismiss-error button");
@@ -919,9 +1051,9 @@ class FullPageTranslationsTestUtils {
    */
   static async clickRestoreButton() {
     logAction();
-    const { restoreButton } = TranslationsPanel.elements;
+    const { restoreButton } = FullPageTranslationsPanel.elements;
     assertVisibility({ visible: { restoreButton } });
-    await FullPageTranslationsTestUtils.waitForTranslationsPopupEvent(
+    await FullPageTranslationsTestUtils.waitForPanelPopupEvent(
       "popuphidden",
       () => {
         click(restoreButton, "Click the restore-page button");
@@ -957,9 +1089,9 @@ class FullPageTranslationsTestUtils {
     pivotTranslation = false,
   } = {}) {
     logAction();
-    const { translateButton } = TranslationsPanel.elements;
+    const { translateButton } = FullPageTranslationsPanel.elements;
     assertVisibility({ visible: { translateButton } });
-    await FullPageTranslationsTestUtils.waitForTranslationsPopupEvent(
+    await FullPageTranslationsTestUtils.waitForPanelPopupEvent(
       "popuphidden",
       () => {
         click(translateButton);
@@ -986,25 +1118,23 @@ class FullPageTranslationsTestUtils {
    * @param {boolean} config.openWithKeyboard
    *  - Open the panel by synthesizing the keyboard. If false, synthesizes the mouse.
    */
-  static async openTranslationsPanel({
+  static async openPanel({
     onOpenPanel = null,
     openFromAppMenu = false,
     openWithKeyboard = false,
   }) {
     logAction();
-    await closeTranslationsPanelIfOpen();
+    await closeAllOpenPanelsAndMenus();
     if (openFromAppMenu) {
-      await FullPageTranslationsTestUtils.#openTranslationsPanelViaAppMenu({
+      await FullPageTranslationsTestUtils.#openPanelViaAppMenu({
         onOpenPanel,
         openWithKeyboard,
       });
     } else {
-      await FullPageTranslationsTestUtils.#openTranslationsPanelViaTranslationsButton(
-        {
-          onOpenPanel,
-          openWithKeyboard,
-        }
-      );
+      await FullPageTranslationsTestUtils.#openPanelViaTranslationsButton({
+        onOpenPanel,
+        openWithKeyboard,
+      });
     }
   }
 
@@ -1017,7 +1147,7 @@ class FullPageTranslationsTestUtils {
    * @param {boolean} config.openWithKeyboard
    *  - Open the panel by synthesizing the keyboard. If false, synthesizes the mouse.
    */
-  static async #openTranslationsPanelViaAppMenu({
+  static async #openPanelViaAppMenu({
     onOpenPanel = null,
     openWithKeyboard = false,
   }) {
@@ -1038,7 +1168,7 @@ class FullPageTranslationsTestUtils {
       "The app-menu translate button should be enabled"
     );
 
-    await FullPageTranslationsTestUtils.waitForTranslationsPopupEvent(
+    await FullPageTranslationsTestUtils.waitForPanelPopupEvent(
       "popupshown",
       () => {
         if (openWithKeyboard) {
@@ -1060,7 +1190,7 @@ class FullPageTranslationsTestUtils {
    * @param {boolean} config.openWithKeyboard
    *  - Open the panel by synthesizing the keyboard. If false, synthesizes the mouse.
    */
-  static async #openTranslationsPanelViaTranslationsButton({
+  static async #openPanelViaTranslationsButton({
     onOpenPanel = null,
     openWithKeyboard = false,
   }) {
@@ -1070,7 +1200,7 @@ class FullPageTranslationsTestUtils {
         { button: true },
         "The translations button is visible."
       );
-    await FullPageTranslationsTestUtils.waitForTranslationsPopupEvent(
+    await FullPageTranslationsTestUtils.waitForPanelPopupEvent(
       "popupshown",
       () => {
         if (openWithKeyboard) {
@@ -1091,7 +1221,7 @@ class FullPageTranslationsTestUtils {
     logAction();
     const gearIcons = getAllByL10nId("translations-panel-settings-button");
     for (const gearIcon of gearIcons) {
-      if (gearIcon.hidden) {
+      if (BrowserTestUtils.isHidden(gearIcon)) {
         continue;
       }
       click(gearIcon, "Open the settings menu");
@@ -1114,7 +1244,7 @@ class FullPageTranslationsTestUtils {
    */
   static switchSelectedFromLanguage(langTag) {
     logAction(langTag);
-    const { fromMenuList } = TranslationsPanel.elements;
+    const { fromMenuList } = FullPageTranslationsPanel.elements;
     fromMenuList.value = langTag;
     fromMenuList.dispatchEvent(new Event("command"));
   }
@@ -1126,7 +1256,7 @@ class FullPageTranslationsTestUtils {
    */
   static switchSelectedToLanguage(langTag) {
     logAction(langTag);
-    const { toMenuList } = TranslationsPanel.elements;
+    const { toMenuList } = FullPageTranslationsPanel.elements;
     toMenuList.value = langTag;
     toMenuList.dispatchEvent(new Event("command"));
   }
@@ -1142,26 +1272,19 @@ class FullPageTranslationsTestUtils {
    *   An optional assertion to be made immediately after the event occurs.
    * @returns {Promise<void>}
    */
-  static async waitForTranslationsPopupEvent(
+  static async waitForPanelPopupEvent(
     eventName,
     callback,
     postEventAssertion = null
   ) {
     // De-lazify the panel elements.
-    TranslationsPanel.elements;
-    const panel = document.getElementById("translations-panel");
-    if (!panel) {
-      throw new Error("Unable to find the translations panel element.");
-    }
-    const promise = BrowserTestUtils.waitForEvent(panel, eventName);
-    await callback();
-    info("Waiting for the translations panel popup to be shown");
-    await promise;
-    if (postEventAssertion) {
-      postEventAssertion();
-    }
-    // Wait a single tick on the event loop.
-    await new Promise(resolve => setTimeout(resolve, 0));
+    FullPageTranslationsPanel.elements;
+    await SharedTranslationsTestUtils._waitForPopupEvent(
+      "full-page-translations-panel",
+      eventName,
+      callback,
+      postEventAssertion
+    );
   }
 }
 
@@ -1210,8 +1333,7 @@ class SelectTranslationsTestUtils {
       info(message);
     }
 
-    await closeTranslationsPanelIfOpen();
-    await closeContextMenuIfOpen();
+    await closeAllOpenPanelsAndMenus();
 
     await SelectTranslationsTestUtils.openContextMenu(runInPage, {
       selectFirstParagraph,
@@ -1274,8 +1396,106 @@ class SelectTranslationsTestUtils {
         );
       }
     }
+  }
+
+  /**
+   * Asserts that for each provided expectation, the visible state of the corresponding
+   * element in FullPageTranslationsPanel.elements both exists and matches the visibility expectation.
+   *
+   * @param {object} expectations
+   *   A list of expectations for the visibility of any subset of SelectTranslationsPanel.elements
+   */
+  static #assertPanelElementVisibility(expectations = {}) {
+    SharedTranslationsTestUtils._assertPanelElementVisibility(
+      SelectTranslationsPanel.elements,
+      {
+        betaIcon: false,
+        copyButton: false,
+        doneButton: false,
+        fromLabel: false,
+        fromMenuList: false,
+        header: false,
+        textArea: false,
+        toLabel: false,
+        toMenuList: false,
+        translateFullPageButton: false,
+        // Overwrite any of the above defaults with the passed in expectations.
+        ...expectations,
+      }
+    );
+  }
 
-    await closeContextMenuIfOpen();
+  /**
+   * Asserts that the mainViewId of the panel matches the given string.
+   *
+   * @param {string} expectedId
+   */
+  static #assertPanelMainViewId(expectedId) {
+    SharedTranslationsTestUtils._assertPanelMainViewId(
+      SelectTranslationsPanel,
+      expectedId
+    );
+  }
+
+  /**
+   * Asserts that panel element visibility matches the default panel view.
+   */
+  static assertPanelViewDefault() {
+    info("Checking that the select-translations panel shows the default view");
+    SelectTranslationsTestUtils.#assertPanelMainViewId(
+      "select-translations-panel-view-default"
+    );
+    SelectTranslationsTestUtils.#assertPanelElementVisibility({
+      betaIcon: true,
+      fromLabel: true,
+      fromMenuList: true,
+      header: true,
+      textArea: true,
+      toLabel: true,
+      toMenuList: true,
+      copyButton: true,
+      doneButton: true,
+      translateFullPageButton: true,
+    });
+  }
+
+  /**
+   * Asserts that the selected from-language matches the provided language tag.
+   *
+   * @param {string} langTag - A BCP-47 language tag.
+   */
+  static assertSelectedFromLanguage({ langTag, l10nId }) {
+    SharedTranslationsTestUtils._assertSelectedFromLanguage(
+      SelectTranslationsPanel,
+      { langTag, l10nId }
+    );
+  }
+
+  /**
+   * Asserts that the selected to-language matches the provided language tag.
+   *
+   * @param {string} langTag - A BCP-47 language tag.
+   */
+  static assertSelectedToLanguage({ langTag, l10nId }) {
+    SharedTranslationsTestUtils._assertSelectedToLanguage(
+      SelectTranslationsPanel,
+      { langTag, l10nId }
+    );
+  }
+
+  /**
+   * Simulates clicking the done button and waits for the panel to close.
+   */
+  static async clickDoneButton() {
+    logAction();
+    const { doneButton } = SelectTranslationsPanel.elements;
+    assertVisibility({ visible: { doneButton } });
+    await SelectTranslationsTestUtils.waitForPanelPopupEvent(
+      "popuphidden",
+      () => {
+        click(doneButton, "Clicking the done button");
+      }
+    );
   }
 
   /**
@@ -1325,38 +1545,62 @@ class SelectTranslationsTestUtils {
     }
 
     if (openAtFirstParagraph === true) {
-      await runInPage(async TranslationsTest => {
-        const { getFirstParagraph } = TranslationsTest.getSelectors();
-        const paragraph = getFirstParagraph();
-        await TranslationsTest.rightClickContentElement(paragraph);
-      });
+      await SharedTranslationsTestUtils._waitForPopupEvent(
+        "contentAreaContextMenu",
+        "popupshown",
+        async () => {
+          await runInPage(async TranslationsTest => {
+            const { getFirstParagraph } = TranslationsTest.getSelectors();
+            const paragraph = getFirstParagraph();
+            await TranslationsTest.rightClickContentElement(paragraph);
+          });
+        }
+      );
       return;
     }
 
     if (openAtSpanishParagraph === true) {
-      await runInPage(async TranslationsTest => {
-        const { getSpanishParagraph } = TranslationsTest.getSelectors();
-        const paragraph = getSpanishParagraph();
-        await TranslationsTest.rightClickContentElement(paragraph);
-      });
+      await SharedTranslationsTestUtils._waitForPopupEvent(
+        "contentAreaContextMenu",
+        "popupshown",
+        async () => {
+          await runInPage(async TranslationsTest => {
+            const { getSpanishParagraph } = TranslationsTest.getSelectors();
+            const paragraph = getSpanishParagraph();
+            await TranslationsTest.rightClickContentElement(paragraph);
+          });
+        }
+      );
       return;
     }
 
     if (openAtEnglishHyperlink === true) {
-      await runInPage(async TranslationsTest => {
-        const { getEnglishHyperlink } = TranslationsTest.getSelectors();
-        const hyperlink = getEnglishHyperlink();
-        await TranslationsTest.rightClickContentElement(hyperlink);
-      });
+      await SharedTranslationsTestUtils._waitForPopupEvent(
+        "contentAreaContextMenu",
+        "popupshown",
+        async () => {
+          await runInPage(async TranslationsTest => {
+            const { getEnglishHyperlink } = TranslationsTest.getSelectors();
+            const hyperlink = getEnglishHyperlink();
+            await TranslationsTest.rightClickContentElement(hyperlink);
+          });
+        }
+      );
       return;
     }
 
     if (openAtSpanishHyperlink === true) {
-      await runInPage(async TranslationsTest => {
-        const { getSpanishHyperlink } = TranslationsTest.getSelectors();
-        const hyperlink = getSpanishHyperlink();
-        await TranslationsTest.rightClickContentElement(hyperlink);
-      });
+      await SharedTranslationsTestUtils._waitForPopupEvent(
+        "contentAreaContextMenu",
+        "popupshown",
+        async () => {
+          await runInPage(async TranslationsTest => {
+            const { getSpanishHyperlink } = TranslationsTest.getSelectors();
+            const hyperlink = getSpanishHyperlink();
+            await TranslationsTest.rightClickContentElement(hyperlink);
+          });
+        }
+      );
       return;
     }
 
@@ -1364,6 +1608,96 @@ class SelectTranslationsTestUtils {
       "openContextMenu() was not provided a declaration for which element to open the menu at."
     );
   }
+
+  /**
+   * Opens the Select Translations panel via the context menu based on specified options.
+   *
+   * @param {Function} runInPage - A content-exposed function to run within the context of the page.
+   * @param {object} options - Options for selecting paragraphs and opening the context menu.
+   * @param {boolean} options.selectFirstParagraph - Selects the first paragraph before opening the context menu.
+   * @param {boolean} options.selectSpanishParagraph - Selects the Spanish paragraph before opening the context menu.
+   *                                                   This is only available in SPANISH_TEST_PAGE.
+   * @param {string} options.expectedTargetLanguage - The target language for translation.
+   * @param {boolean} options.openAtFirstParagraph - Opens the context menu at the first paragraph.
+   * @param {boolean} options.openAtSpanishParagraph - Opens at the Spanish paragraph.
+   *                                                   This is only available in SPANISH_TEST_PAGE.
+   * @param {boolean} options.openAtEnglishHyperlink - Opens at the English hyperlink.
+   *                                                   This is only available in SPANISH_TEST_PAGE.
+   * @param {boolean} options.openAtSpanishHyperlink - Opens at the Spanish hyperlink.
+   *                                                   This is only available in SPANISH_TEST_PAGE.
+   * @param {Function|null} [options.onOpenPanel=null] - An optional callback function to execute after the panel opens.
+   * @param {string|null} [message=null] - An optional message to log to info.
+   * @throws Throws an error if the context menu could not be opened with the provided options.
+   * @returns {Promise<void>}
+   */
+  static async openPanel(
+    runInPage,
+    {
+      selectFirstParagraph,
+      selectSpanishParagraph,
+      expectedTargetLanguage,
+      openAtFirstParagraph,
+      openAtSpanishParagraph,
+      openAtEnglishHyperlink,
+      openAtSpanishHyperlink,
+      onOpenPanel,
+    },
+    message
+  ) {
+    logAction();
+
+    if (message) {
+      info(message);
+    }
+
+    await SelectTranslationsTestUtils.assertContextMenuTranslateSelectionItem(
+      runInPage,
+      {
+        selectFirstParagraph,
+        selectSpanishParagraph,
+        expectedTargetLanguage,
+        openAtFirstParagraph,
+        openAtSpanishParagraph,
+        openAtEnglishHyperlink,
+        openAtSpanishHyperlink,
+      },
+      message
+    );
+
+    const menuItem = getById("context-translate-selection");
+
+    await SelectTranslationsTestUtils.waitForPanelPopupEvent(
+      "popupshown",
+      () => click(menuItem),
+      onOpenPanel
+    );
+  }
+
+  /**
+   * XUL popups will fire the popupshown and popuphidden events. These will fire for
+   * any type of popup in the browser. This function waits for one of those events, and
+   * checks that the viewId of the popup is PanelUI-profiler
+   *
+   * @param {"popupshown" | "popuphidden"} eventName
+   * @param {Function} callback
+   * @param {Function} postEventAssertion
+   *   An optional assertion to be made immediately after the event occurs.
+   * @returns {Promise<void>}
+   */
+  static async waitForPanelPopupEvent(
+    eventName,
+    callback,
+    postEventAssertion = null
+  ) {
+    // De-lazify the panel elements.
+    SelectTranslationsPanel.elements;
+    await SharedTranslationsTestUtils._waitForPopupEvent(
+      "select-translations-panel",
+      eventName,
+      callback,
+      postEventAssertion
+    );
+  }
 }
 
 class TranslationsSettingsTestUtils {