1 files changed, 28 insertions, 11 deletions

diff --git a/browser/components/screenshots/tests/browser/head.js b/browser/components/screenshots/tests/browser/head.js
index 171e3b8c41..a36e955830 100644
--- a/browser/components/screenshots/tests/browser/head.js
+++ b/browser/components/screenshots/tests/browser/head.js
@@ -38,15 +38,21 @@ const MouseEvents = {
     {},
     {
       get: (target, name) =>
-        async function (x, y, options = {}) {
+        async function (x, y, options = {}, browser) {
           if (name === "click") {
-            this.down(x, y, options);
-            this.up(x, y, options);
+            this.down(x, y, options, browser);
+            this.up(x, y, options, browser);
           } else {
-            await safeSynthesizeMouseEventInContentPage(":root", x, y, {
-              type: "mouse" + name,
-              ...options,
-            });
+            await safeSynthesizeMouseEventInContentPage(
+              ":root",
+              x,
+              y,
+              {
+                type: "mouse" + name,
+                ...options,
+              },
+              browser
+            );
           }
         },
     }
@@ -276,10 +282,15 @@ class ScreenshotsHelper {
       this.waitForStateChange("resizing"),
     ]);
     Assert.ok(true, "The overlay is in the dragging or resizing state");
-
+    // We intentionally turn off this a11y check, because the following mouse
+    // event is emitted at the end of the dragging event. Its keyboard
+    // accessible alternative is provided and tested elsewhere, therefore
+    // this rule check shall be ignored by a11y_checks suite.
+    AccessibilityUtils.setEnv({ mustHaveAccessibleRule: false });
     mouse.up(endX, endY);
 
     await this.assertStateChange("selected");
+    AccessibilityUtils.resetEnv();
 
     this.endX = endX;
     this.endY = endY;
@@ -474,7 +485,7 @@ class ScreenshotsHelper {
     );
 
     info(`clicking cancel button at ${x}, ${y}`);
-    mouse.click(x, y);
+    mouse.click(x, y, {}, this.browser);
   }
 
   async clickPreviewCancelButton() {
@@ -878,9 +889,15 @@ async function safeSynthesizeMouseEventInContentPage(
   selector,
   x,
   y,
-  options = {}
+  options = {},
+  browser
 ) {
-  let context = gBrowser.selectedBrowser.browsingContext;
+  let context;
+  if (!browser) {
+    context = gBrowser.selectedBrowser.browsingContext;
+  } else {
+    context = browser.browsingContext;
+  }
   BrowserTestUtils.synthesizeMouse(selector, x, y, options, context);
 }