Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

28 files changed, 2148 insertions, 0 deletions

diff --git a/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/SpecialMessageActionSchemas.json b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/SpecialMessageActionSchemas.json
new file mode 100644
index 0000000000..4c9bccf8a6
--- /dev/null
+++ b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/SpecialMessageActionSchemas.json
@@ -0,0 +1,600 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "$ref": "#/definitions/SpecialMessageActionSchemas",
+  "definitions": {
+    "SpecialMessageActionSchemas": {
+      "anyOf": [
+        {
+          "type": "object",
+          "properties": {
+            "type": {
+              "type": "string",
+              "enum": ["DISABLE_STP_DOORHANGERS"]
+            }
+          },
+          "required": ["type"],
+          "additionalProperties": false,
+          "description": "Disables all STP doorhangers."
+        },
+        {
+          "type": "object",
+          "properties": {
+            "data": {
+              "type": "object",
+              "properties": {
+                "args": {
+                  "type": "string",
+                  "description": "The element to highlight"
+                }
+              },
+              "required": ["args"],
+              "additionalProperties": false
+            },
+            "type": {
+              "type": "string",
+              "enum": ["HIGHLIGHT_FEATURE"]
+            }
+          },
+          "required": ["data", "type"],
+          "additionalProperties": false,
+          "description": "Highlights an element, such as a menu item"
+        },
+        {
+          "type": "object",
+          "properties": {
+            "data": {
+              "type": "object",
+              "properties": {
+                "telemetrySource": {
+                  "type": "string"
+                },
+                "url": {
+                  "type": "string"
+                }
+              },
+              "required": ["telemetrySource", "url"],
+              "additionalProperties": false
+            },
+            "type": {
+              "type": "string",
+              "enum": ["INSTALL_ADDON_FROM_URL"]
+            }
+          },
+          "required": ["data", "type"],
+          "additionalProperties": false,
+          "description": "Install an add-on from AMO"
+        },
+        {
+          "type": "object",
+          "properties": {
+            "data": {
+              "type": "object",
+              "properties": {
+                "args": {
+                  "type": "string",
+                  "description": "The about page. E.g. \"welcome\" for about:welcome'"
+                },
+                "where": {
+                  "type": "string",
+                  "enum": ["current", "save", "tab", "tabshifted", "window"],
+                  "description": "Where the URL is opened",
+                  "default": "tab"
+                },
+                "entrypoint": {
+                  "type": "string",
+                  "description": "Any optional entrypoint value that will be added to the search. E.g. \"foo=bar\" would result in about:welcome?foo=bar'"
+                }
+              },
+              "required": ["args", "where", "entrypoint"],
+              "additionalProperties": false
+            },
+            "type": {
+              "type": "string",
+              "enum": ["OPEN_ABOUT_PAGE"]
+            }
+          },
+          "required": ["data", "type"],
+          "additionalProperties": false,
+          "description": "Opens an about: page in Firefox"
+        },
+        {
+          "type": "object",
+          "properties": {
+            "type": {
+              "type": "string",
+              "enum": ["OPEN_FIREFOX_VIEW"]
+            }
+          },
+          "required": ["type"],
+          "additionalProperties": false,
+          "description": "Opens the Firefox View pseudo-pinned-tab"
+        },
+        {
+          "type": "object",
+          "properties": {
+            "data": {
+              "type": "object",
+              "properties": {
+                "args": {
+                  "type": "string",
+                  "description": "The menu name, e.g. \"appMenu\""
+                }
+              },
+              "required": ["args"],
+              "additionalProperties": false
+            },
+            "type": {
+              "type": "string",
+              "enum": ["OPEN_APPLICATIONS_MENU"]
+            }
+          },
+          "required": ["data", "type"],
+          "additionalProperties": false,
+          "description": "Opens an application menu"
+        },
+        {
+          "type": "object",
+          "properties": {
+            "type": {
+              "type": "string",
+              "enum": ["OPEN_AWESOME_BAR"]
+            }
+          },
+          "required": ["type"],
+          "additionalProperties": false,
+          "description": "Focuses and expands the awesome bar"
+        },
+        {
+          "type": "object",
+          "properties": {
+            "data": {
+              "type": "object",
+              "properties": {
+                "category": {
+                  "type": "string",
+                  "description": "Section of about:preferences, e.g. \"privacy-reports\""
+                },
+                "entrypoint": {
+                  "type": "string",
+                  "description": "Add a queryparam for metrics"
+                }
+              },
+              "required": ["category"],
+              "additionalProperties": false
+            },
+            "type": {
+              "type": "string",
+              "enum": ["OPEN_PREFERENCES_PAGE"]
+            }
+          },
+          "required": ["data", "type"],
+          "additionalProperties": false,
+          "description": "Opens a preference page"
+        },
+        {
+          "type": "object",
+          "properties": {
+            "type": {
+              "type": "string",
+              "enum": ["OPEN_PRIVATE_BROWSER_WINDOW"]
+            }
+          },
+          "required": ["type"],
+          "additionalProperties": false,
+          "description": "Opens a private browsing window."
+        },
+        {
+          "type": "object",
+          "properties": {
+            "type": {
+              "type": "string",
+              "enum": ["OPEN_PROTECTION_PANEL"]
+            }
+          },
+          "required": ["type"],
+          "additionalProperties": false,
+          "description": "Opens the protections panel"
+        },
+        {
+          "type": "object",
+          "properties": {
+            "type": {
+              "type": "string",
+              "enum": ["OPEN_PROTECTION_REPORT"]
+            }
+          },
+          "required": ["type"],
+          "additionalProperties": false,
+          "description": "Opens the protections panel report"
+        },
+        {
+          "type": "object",
+          "properties": {
+            "data": {
+              "type": "object",
+              "properties": {
+                "args": {
+                  "type": "string",
+                  "description": "URL to open"
+                },
+                "where": {
+                  "type": "string",
+                  "enum": ["current", "save", "tab", "tabshifted", "window"],
+                  "description": "Where the URL is opened",
+                  "default": "tab"
+                }
+              },
+              "required": ["args", "where"],
+              "additionalProperties": false
+            },
+            "type": {
+              "type": "string",
+              "enum": ["OPEN_URL"]
+            }
+          },
+          "required": ["data", "type"],
+          "additionalProperties": false,
+          "description": "Opens given URL"
+        },
+        {
+          "type": "object",
+          "properties": {
+            "type": {
+              "type": "string",
+              "enum": ["PIN_CURRENT_TAB"]
+            }
+          },
+          "required": ["type"],
+          "additionalProperties": false,
+          "description": "Pin the current tab"
+        },
+        {
+          "type": "object",
+          "properties": {
+            "type": {
+              "type": "string",
+              "enum": ["SHOW_FIREFOX_ACCOUNTS"]
+            },
+            "data": {
+              "type": "object",
+              "properties": {
+                "entrypoint": {
+                  "type": "string",
+                  "description": "Adds entrypoint={your value} to the FXA URL"
+                },
+                "extraParams": {
+                  "type": "object",
+                  "description": "Any extra parameter that will be added to the FXA URL. E.g. {foo: bar} would result in <FXA_url>?foo=bar'"
+                }
+              },
+              "required": ["entrypoint"],
+              "additionalProperties": false
+            }
+          },
+          "required": ["type", "data"],
+          "additionalProperties": false,
+          "description": "Show Firefox Accounts"
+        },
+        {
+          "type": "object",
+          "properties": {
+            "type": {
+              "type": "string",
+              "enum": ["SHOW_MIGRATION_WIZARD"]
+            },
+            "data": {
+              "type": "object",
+              "properties": {
+                "source": {
+                  "type": "string",
+                  "description": "Identitifer of the browser that should be pre-selected in the import migration wizard popup (e.g. 'chrome'), See https://searchfox.org/mozilla-central/rev/8dae1cc76a6b45e05198bc0d5d4edb7bf1003265/browser/components/migration/MigrationUtils.jsm#917"
+                }
+              },
+              "additionalProperties": false
+            }
+          },
+          "required": ["type"],
+          "additionalProperties": false,
+          "description": "Shows the Migration Wizard to import data from another Browser. See https://support.mozilla.org/en-US/kb/import-data-another-browser\""
+        },
+        {
+          "type": "object",
+          "properties": {
+            "type": {
+              "type": "string",
+              "enum": ["CANCEL"]
+            }
+          },
+          "required": ["type"],
+          "additionalProperties": false,
+          "description": "Minimize the CFR doorhanger back into the URLbar"
+        },
+        {
+          "type": "object",
+          "properties": {
+            "type": {
+              "type": "string",
+              "enum": ["ACCEPT_DOH"]
+            }
+          },
+          "required": ["type"],
+          "additionalProperties": false,
+          "description": "Accept DOH doorhanger notification"
+        },
+        {
+          "type": "object",
+          "properties": {
+            "type": {
+              "type": "string",
+              "enum": ["DISABLE_DOH"]
+            }
+          },
+          "required": ["type"],
+          "additionalProperties": false,
+          "description": "Dismiss DOH doorhanger notification"
+        },
+        {
+          "type": "object",
+          "properties": {
+            "type": {
+              "type": "string",
+              "enum": ["PIN_FIREFOX_TO_TASKBAR"]
+            },
+            "data": {
+              "type": "object",
+              "properties": {
+                "privatePin": {
+                  "type": "boolean",
+                  "description": "Whether or not to pin private browsing mode"
+                }
+              },
+              "additionalProperties": false
+            }
+          },
+          "required": ["type"],
+          "additionalProperties": false,
+          "description": "Pin the app to taskbar"
+        },
+        {
+          "type": "object",
+          "properties": {
+            "type": {
+              "type": "string",
+              "enum": ["SET_DEFAULT_BROWSER"]
+            }
+          },
+          "required": ["type"],
+          "additionalProperties": false,
+          "description": "Message action to set Firefox as default browser"
+        },
+        {
+          "type": "object",
+          "properties": {
+            "type": {
+              "type": "string",
+              "enum": ["SET_DEFAULT_PDF_HANDLER"]
+            },
+            "data": {
+              "type": "object",
+              "properties": {
+                "onlyIfKnownBrowser": {
+                  "type": "boolean",
+                  "description": "Only set Firefox as the default PDF handler if the current PDF handler is a known browser."
+                }
+              },
+              "additionalProperties": false
+            }
+          },
+          "required": ["type"],
+          "additionalProperties": false,
+          "description": "Message action to set Firefox as the default PDF handler"
+        },
+        {
+          "type": "object",
+          "properties": {
+            "type": {
+              "type": "string",
+              "enum": ["DECLINE_DEFAULT_PDF_HANDLER"]
+            }
+          },
+          "required": ["type"],
+          "additionalProperties": false,
+          "description": "Message action to decline setting Firefox as the default PDF handler"
+        },
+        {
+          "type": "object",
+          "properties": {
+            "data": {
+              "type": "object",
+              "properties": {
+                "homePage": {
+                  "type": "string",
+                  "description": "Should reset homepage pref",
+                  "enum": ["default"]
+                },
+                "newtab": {
+                  "type": "string",
+                  "enum": ["default"],
+                  "description": "Should reset newtab pref"
+                },
+                "layout": {
+                  "type": "object",
+                  "description": "Section name and boolean value that specifies if the section should be on or off.",
+                  "properties": {
+                    "search": {
+                      "type": "boolean"
+                    },
+                    "topsites": {
+                      "type": "boolean"
+                    },
+                    "highlights": {
+                      "type": "boolean"
+                    },
+                    "topstories": {
+                      "type": "boolean"
+                    }
+                  },
+                  "required": [
+                    "search",
+                    "topsites",
+                    "highlights",
+                    "topstories"
+                  ],
+                  "additionalProperties": false
+                }
+              },
+              "additionalProperties": false
+            },
+            "type": {
+              "type": "string",
+              "enum": ["CONFIGURE_HOMEPAGE"]
+            }
+          },
+          "required": ["data", "type"],
+          "additionalProperties": false,
+          "description": "Resets homepage pref and sections layout"
+        },
+        {
+          "type": "object",
+          "properties": {
+            "data": {
+              "type": "object",
+              "properties": {
+                "content": {
+                  "type": "object",
+                  "description": "Object containing content rendered inside spotlight dialog"
+                }
+              },
+              "required": ["content"],
+              "additionalProperties": false
+            },
+            "type": {
+              "type": "string",
+              "enum": ["SHOW_SPOTLIGHT"]
+            }
+          },
+          "required": ["data", "type"],
+          "additionalProperties": false,
+          "description": "Opens a spotlight dialog"
+        },
+        {
+          "type": "object",
+          "properties": {
+            "data": {
+              "type": "object",
+              "properties": {
+                "id": {
+                  "type": "string",
+                  "description": "Message id to block"
+                }
+              },
+              "required": ["id"],
+              "additionalProperties": false
+            },
+            "type": {
+              "type": "string",
+              "enum": ["BLOCK_MESSAGE"]
+            }
+          },
+          "required": ["data", "type"],
+          "additionalProperties": false,
+          "description": "Add message to an indexedDb list of blocked messages"
+        },
+        {
+          "type": "object",
+          "properties": {
+            "data": {
+              "type": "object",
+              "properties": {
+                "pref": {
+                  "type": "object",
+                  "properties": {
+                    "name": {
+                      "type": "string"
+                    },
+                    "value": {
+                      "type": ["boolean", "string", "number", "null"]
+                    }
+                  },
+                  "description": "An object representing a pref containing a name and a value."
+                }
+              },
+              "required": ["pref"],
+              "additionalProperties": false
+            },
+            "type": {
+              "type": "string",
+              "enum": ["SET_PREF"]
+            }
+          },
+          "required": ["data", "type"],
+          "additionalProperties": false,
+          "description": "Sets prefs from special message actions"
+        },
+        {
+          "type": "object",
+          "properties": {
+            "data": {
+              "actions": {
+                "type": "array",
+                "items": {
+                  "type": "object",
+                  "description": "A special message action definition"
+                }
+              }
+            },
+            "type": {
+              "type": "string",
+              "enum": ["MULTI_ACTION"]
+            }
+          },
+          "required": ["data", "type"],
+          "additionalProperties": false,
+          "description": "Runs multiple actions"
+        },
+        {
+          "type": "object",
+          "properties": {
+            "data": {
+              "selector": {
+                "type": "string",
+                "description": "A CSS selector for the HTML element to be clicked"
+              }
+            },
+            "type": {
+              "type": "string",
+              "enum": ["CLICK_ELEMENT"]
+            }
+          },
+          "required": ["data", "type"],
+          "additionalProperties": false,
+          "description": "Selects an element in the current Window's document and triggers a click action"
+        },
+        {
+          "type": "object",
+          "properties": {
+            "type": {
+              "type": "string",
+              "enum": ["RELOAD_BROWSER"]
+            }
+          },
+          "required": ["type"],
+          "additionalProperties": false,
+          "description": "Message action that reloads the current browser"
+        },
+        {
+          "type": "object",
+          "properties": {
+            "type": {
+              "type": "string",
+              "enum": ["FOCUS_URLBAR"]
+            }
+          },
+          "required": ["type"],
+          "additionalProperties": false,
+          "description": "Focuses the urlbar in the window the message was displayed in"
+        }
+      ]
+    }
+  }
+}
diff --git a/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/index.md b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/index.md
new file mode 100644
index 0000000000..8b431a66fe
--- /dev/null
+++ b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/index.md
@@ -0,0 +1,341 @@
+# User Actions
+
+A subset of actions are available to messages via fields like `action` on buttons for CFRs.
+
+## Usage
+
+For CFRs, you should add the action `type` in `action` and any additional parameters in `data`. For example:
+
+```json
+"action": {
+  "type": "OPEN_PREFERENCES_PAGE",
+  "data": { "category": "sync" },
+}
+```
+
+## Available Actions
+
+### `OPEN_APPLICATIONS_MENU`
+
+* args: (none)
+
+Opens the applications menu.
+
+### `OPEN_FIREFOX_VIEW`
+
+* args: (none)
+
+Opens the Firefox View pseudo-tab.
+
+### `OPEN_PRIVATE_BROWSER_WINDOW`
+
+* args: (none)
+
+Opens a new private browsing window.
+
+
+### `OPEN_URL`
+
+* args: `string` (a url)
+
+Opens a given url.
+
+Example:
+
+```json
+"action": {
+  "type": "OPEN_URL",
+  "data": { "args": "https://foo.com" },
+}
+```
+
+### `OPEN_ABOUT_PAGE`
+
+* args:
+```ts
+{
+  args: string, // (a valid about page without the `about:` prefix)
+  entrypoint?: string, // URL search param used for referrals
+}
+```
+
+Opens a given about page
+
+Example:
+
+```json
+"action": {
+  "type": "OPEN_ABOUT_PAGE",
+  "data": { "args": "privatebrowsing" },
+}
+```
+
+### `OPEN_PREFERENCES_PAGE`
+
+* args:
+```
+{
+  args?: string, // (a category accessible via a `#`)
+  entrypoint?: string // URL search param used to referrals
+
+Opens `about:preferences` with an optional category accessible via a `#` in the URL (e.g. `about:preferences#home`).
+
+Example:
+
+```json
+"action": {
+  "type": "OPEN_PREFERENCES_PAGE",
+  "data": { "category": "general-cfrfeatures" },
+}
+```
+
+### `SHOW_FIREFOX_ACCOUNTS`
+
+* args: (none)
+
+Opens Firefox accounts sign-up page. Encodes some information that the origin was from snippets by default.
+
+### `FXA_SIGNIN_FLOW`
+
+* args:
+
+```ts
+{
+  // a valid `where` value for `openUILinkIn`. Only `tab` and `window` have been tested, and `tabshifted`
+  // is unlikely to do anything different from `tab`.
+  where?: "tab" | "window" = "tab",
+
+  entrypoint?: string // URL search params string to pass along to FxA. Defaults to "activity-stream-firstrun".
+  extraParams?: object // Extra parameters to pass along to FxA. See FxAccountsConfig.promiseConnectAccountURI.
+}
+```
+
+Opens a Firefox accounts sign-up or sign-in page, and does the work of closing the resulting tab or window once
+sign-in completes. Returns a Promise that resolves to `true` if sign-in succeeded, or to `false` if the sign-in
+window or tab closed before sign-in could be completed.
+
+Encodes some information that the origin was from about:welcome by default.
+
+
+### `SHOW_MIGRATION_WIZARD`
+
+* args: (none)
+
+Opens import wizard to bring in settings and data from another browser.
+
+### `PIN_CURRENT_TAB`
+
+* args: (none)
+
+Pins the currently focused tab.
+
+### `HIGHLIGHT_FEATURE`
+
+Can be used to highlight (show a light blue overlay) a certain button or part of the browser UI.
+
+* args: `string` a [valid targeting defined in the UITour](https://searchfox.org/mozilla-central/rev/7fd1c1c34923ece7ad8c822bee062dd0491d64dc/browser/components/uitour/UITour.jsm#108)
+
+### `INSTALL_ADDON_FROM_URL`
+
+Can be used to install an addon from addons.mozilla.org.
+
+* args:
+```ts
+{
+  url: string,
+  telemetrySource?: string
+};
+```
+
+### `OPEN_PROTECTION_REPORT`
+
+Opens `about:protections`
+
+### `OPEN_PROTECTION_PANEL`
+
+Opens the protection panel behind on the lock icon of the awesomebar
+
+### `DISABLE_STP_DOORHANGERS`
+
+Disables all Social Tracking Protection messages
+
+* args: (none)
+
+### `OPEN_AWESOME_BAR`
+
+Focuses and expands the awesome bar.
+
+* args: (none)
+
+### `CANCEL`
+
+No-op action used to dismiss CFR notifications (but not remove or block them)
+
+* args: (none)
+
+### `DISABLE_DOH`
+
+User action for turning off the DoH feature
+
+* args: (none)
+
+### `ACCEPT_DOH`
+
+User action for continuing to use the DoH feature
+
+* args: (none)
+
+### `CONFIGURE_HOMEPAGE`
+
+Action for configuring the user homepage and restoring defaults.
+
+* args:
+```ts
+{
+  homePage: "default" | null;
+  newtab: "default" | null;
+  layout: {
+    search: boolean;
+    topsites: boolean;
+    highlights: boolean;
+    topstories: boolean;
+  }
+}
+```
+
+### `PIN_FIREFOX_TO_TASKBAR`
+
+Action for pinning Firefox to the user's taskbar.
+
+* args: (none)
+
+### `SET_DEFAULT_BROWSER`
+
+Action for setting the default browser to Firefox on the user's system.
+
+- args: (none)
+
+### `SET_DEFAULT_PDF_HANDLER`
+
+Action for setting the default PDF handler to Firefox on the user's system.
+
+Windows only.
+
+- args:
+```ts
+{
+  // Only set Firefox as the default PDF handler if the current PDF handler is a
+  // known browser.
+  onlyIfKnownBrowser?: boolean;
+}
+```
+
+### `DECLINE_DEFAULT_PDF_HANDLER`
+
+Action for declining to set the default PDF handler to Firefox on the user's
+system. Prevents the user from being asked again about this.
+
+Windows only.
+
+- args: (none)
+
+### `SHOW_SPOTLIGHT`
+
+Action for opening a spotlight tab or window modal using the content passed to the dialog.
+
+### `BLOCK_MESSAGE`
+
+Disable a message by adding to an indexedDb list of blocked messages
+
+* args: `string` id of the message
+
+### `SET_PREF`
+
+Action for setting various browser prefs
+
+Prefs that can be changed with this action are:
+
+- `browser.dataFeatureRecommendations.enabled`
+- `browser.migrate.content-modal.about-welcome-behavior`
+- `browser.migrate.content-modal.import-all.enabled`
+- `browser.migrate.preferences-entrypoint.enabled`
+- `browser.shopping.experience2023.active`
+- `browser.shopping.experience2023.optedIn`
+- `browser.shopping.experience2023.survey.optedInTime`
+- `browser.shopping.experience2023.survey.hasSeen`
+- `browser.shopping.experience2023.survey.pdpVisits`
+- `browser.startup.homepage`
+- `browser.startup.windowsLaunchOnLogin.disableLaunchOnLoginPrompt`
+- `browser.privateWindowSeparation.enabled`
+- `browser.firefox-view.feature-tour`
+- `browser.pdfjs.feature-tour`
+- `browser.newtab.feature-tour`
+- `cookiebanners.service.mode`
+- `cookiebanners.service.mode.privateBrowsing`
+- `cookiebanners.service.detectOnly`
+- `messaging-system.askForFeedback`
+
+Any pref that begins with `messaging-system-action.` is also allowed.
+Alternatively, if the pref is not present in the list above and does not begin
+with `messaging-system-action.`, it will be created and prepended with
+`messaging-system-action.`. For example, `example.pref` will be created as
+`messaging-system-action.example.pref`.
+
+* args:
+```ts
+{
+  pref: {
+    name: string;
+    value: string | boolean | number;
+  }
+}
+```
+
+### `MULTI_ACTION`
+
+Action for running multiple actions. Actions should be included in an array of actions.
+
+* args:
+```ts
+{
+  actions: Array<UserAction>
+}
+```
+
+* example:
+```json
+"action": {
+  "type": "MULTI_ACTION",
+  "data": {
+    "actions": [
+      {
+        "type": "OPEN_URL",
+        "args": "https://www.example.com"
+      },
+      {
+        "type": "OPEN_AWESOME_BAR"
+      }
+    ]
+  }
+}
+```
+
+### `CLICK_ELEMENT`
+
+* args: `string` A CSS selector for the HTML element to be clicked
+
+Selects an element in the current Window's document and triggers a click action
+
+
+### `RELOAD_BROWSER`
+
+* args: (none)
+
+Action for reloading the current browser.
+
+
+### `FOCUS_URLBAR`
+
+Focuses the urlbar in the window the message was displayed in
+
+* args: (none)
diff --git a/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser.toml b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser.toml
new file mode 100644
index 0000000000..fc5b6b6550
--- /dev/null
+++ b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser.toml
@@ -0,0 +1,54 @@
+[DEFAULT]
+prefs = ["identity.fxaccounts.remote.root=https://example.com/"]
+support-files = [
+  "head.js",
+  "../../index.md",
+]
+
+["browser_sma.js"]
+
+["browser_sma_accept_doh.js"]
+
+["browser_sma_block_message.js"]
+
+["browser_sma_cfrmessageprovider.js"]
+
+["browser_sma_configure_homepage.js"]
+
+["browser_sma_default_browser.js"]
+
+["browser_sma_default_pdf_handler.js"]
+
+["browser_sma_disable_doh.js"]
+
+["browser_sma_docs.js"]
+
+["browser_sma_handle_multiaction.js"]
+
+["browser_sma_open_about_page.js"]
+
+["browser_sma_open_awesome_bar.js"]
+
+["browser_sma_open_private_browser_window.js"]
+
+["browser_sma_open_protection_panel.js"]
+
+["browser_sma_open_protection_report.js"]
+
+["browser_sma_open_spotlight_dialog.js"]
+
+["browser_sma_open_url.js"]
+
+["browser_sma_pin_current_tab.js"]
+
+["browser_sma_pin_firefox.js"]
+
+["browser_sma_pin_private_firefox.js"]
+skip-if = ["os != 'win'"]
+
+["browser_sma_set_prefs.js"]
+
+["browser_sma_show_firefox_accounts.js"]
+
+["browser_sma_show_migration_wizard.js"]
+skip-if = ["apple_catalina && debug"] # Bug 1837646
diff --git a/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma.js b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma.js
new file mode 100644
index 0000000000..b46b3730e9
--- /dev/null
+++ b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma.js
@@ -0,0 +1,21 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async function test_unknown_event() {
+  let error;
+  try {
+    await SpecialMessageActions.handleAction(
+      { type: "UNKNOWN_EVENT_123" },
+      gBrowser
+    );
+  } catch (e) {
+    error = e;
+  }
+  ok(error, "should throw if an unexpected event is handled");
+  Assert.equal(
+    error.message,
+    "Special message action with type UNKNOWN_EVENT_123 is unsupported."
+  );
+});
diff --git a/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_accept_doh.js b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_accept_doh.js
new file mode 100644
index 0000000000..f9255b17ec
--- /dev/null
+++ b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_accept_doh.js
@@ -0,0 +1,17 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+const DOH_DOORHANGER_DECISION_PREF = "doh-rollout.doorhanger-decision";
+
+add_task(async function test_disable_doh() {
+  await SpecialPowers.pushPrefEnv({
+    set: [[DOH_DOORHANGER_DECISION_PREF, ""]],
+  });
+  await SMATestUtils.executeAndValidateAction({ type: "ACCEPT_DOH" });
+  Assert.equal(
+    Services.prefs.getStringPref(DOH_DOORHANGER_DECISION_PREF, ""),
+    "UIOk",
+    "Pref should be set on accept"
+  );
+});
diff --git a/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_block_message.js b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_block_message.js
new file mode 100644
index 0000000000..0671253b43
--- /dev/null
+++ b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_block_message.js
@@ -0,0 +1,23 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async function test_block_message() {
+  let blockStub = sinon.stub(SpecialMessageActions, "blockMessageById");
+
+  await SMATestUtils.executeAndValidateAction({
+    type: "BLOCK_MESSAGE",
+    data: {
+      id: "TEST_MESSAGE_ID",
+    },
+  });
+
+  Assert.equal(blockStub.callCount, 1, "blockMessageById called by the action");
+  Assert.equal(
+    blockStub.firstCall.args[0],
+    "TEST_MESSAGE_ID",
+    "Argument is message id"
+  );
+  blockStub.restore();
+});
diff --git a/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_cancel.js b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_cancel.js
new file mode 100644
index 0000000000..ca42dac563
--- /dev/null
+++ b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_cancel.js
@@ -0,0 +1,14 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async function test_cancel_event() {
+  let error = null;
+  try {
+    await SMATestUtils.executeAndValidateAction({ type: "CANCEL" });
+  } catch (e) {
+    error = e;
+  }
+  ok(!error, "should not throw for CANCEL");
+});
diff --git a/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_cfrmessageprovider.js b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_cfrmessageprovider.js
new file mode 100644
index 0000000000..a01b8c8bbf
--- /dev/null
+++ b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_cfrmessageprovider.js
@@ -0,0 +1,31 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const { CFRMessageProvider } = ChromeUtils.importESModule(
+  "resource:///modules/asrouter/CFRMessageProvider.sys.mjs"
+);
+
+add_task(async function test_all_test_messages() {
+  let messagesWithButtons = (await CFRMessageProvider.getMessages()).filter(
+    m => m.content.buttons
+  );
+
+  for (let message of messagesWithButtons) {
+    info(`Testing ${message.id}`);
+    if (message.template === "infobar") {
+      for (let button of message.content.buttons) {
+        await SMATestUtils.validateAction(button.action);
+      }
+    } else {
+      let { primary, secondary } = message.content.buttons;
+      await SMATestUtils.validateAction(primary.action);
+      for (let secondaryBtn of secondary) {
+        if (secondaryBtn.action) {
+          await SMATestUtils.validateAction(secondaryBtn.action);
+        }
+      }
+    }
+  }
+});
diff --git a/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_configure_homepage.js b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_configure_homepage.js
new file mode 100644
index 0000000000..d05ffb7b1f
--- /dev/null
+++ b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_configure_homepage.js
@@ -0,0 +1,103 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const HOMEPAGE_PREF = "browser.startup.homepage";
+const NEWTAB_PREF = "browser.newtabpage.enabled";
+const HIGHLIGHTS_PREF =
+  "browser.newtabpage.activity-stream.feeds.section.highlights";
+const HIGHLIGHTS_ROWS_PREF =
+  "browser.newtabpage.activity-stream.section.highlights.rows";
+const SEARCH_PREF = "browser.newtabpage.activity-stream.showSearch";
+const TOPSITES_PREF = "browser.newtabpage.activity-stream.feeds.topsites";
+const TOPSTORIES_PREF =
+  "browser.newtabpage.activity-stream.feeds.system.topstories";
+
+add_setup(async function () {
+  await SpecialPowers.pushPrefEnv({
+    // Highlights are preffed off by default.
+    set: [
+      [HIGHLIGHTS_PREF, true],
+      [
+        "browser.newtabpage.activity-stream.discoverystream.endpointSpocsClear",
+        "",
+      ],
+    ],
+  });
+
+  registerCleanupFunction(async () => {
+    await SpecialPowers.popPrefEnv();
+    [
+      HOMEPAGE_PREF,
+      NEWTAB_PREF,
+      HIGHLIGHTS_PREF,
+      HIGHLIGHTS_ROWS_PREF,
+      SEARCH_PREF,
+      TOPSITES_PREF,
+    ].forEach(prefName => Services.prefs.clearUserPref(prefName));
+  });
+});
+
+add_task(async function test_CONFIGURE_HOMEPAGE_newtab_home_prefs() {
+  const action = {
+    type: "CONFIGURE_HOMEPAGE",
+    data: { homePage: "default", newtab: "default" },
+  };
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      [HOMEPAGE_PREF, "about:blank"],
+      [NEWTAB_PREF, false],
+    ],
+  });
+
+  Assert.ok(Services.prefs.prefHasUserValue(HOMEPAGE_PREF), "Test setup ok");
+  Assert.ok(Services.prefs.prefHasUserValue(NEWTAB_PREF), "Test setup ok");
+
+  await SMATestUtils.executeAndValidateAction(action);
+
+  Assert.ok(
+    !Services.prefs.prefHasUserValue(HOMEPAGE_PREF),
+    "Homepage pref should be back to default"
+  );
+  Assert.ok(
+    !Services.prefs.prefHasUserValue(NEWTAB_PREF),
+    "Newtab pref should be back to default"
+  );
+});
+
+add_task(async function test_CONFIGURE_HOMEPAGE_layout_prefs() {
+  const action = {
+    type: "CONFIGURE_HOMEPAGE",
+    data: {
+      layout: {
+        search: true,
+        topsites: false,
+        highlights: false,
+        topstories: false,
+      },
+    },
+  };
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      [HIGHLIGHTS_ROWS_PREF, 3],
+      [SEARCH_PREF, false],
+    ],
+  });
+
+  await SMATestUtils.executeAndValidateAction(action);
+
+  Assert.ok(Services.prefs.getBoolPref(SEARCH_PREF), "Search is turned on");
+  Assert.ok(
+    !Services.prefs.getBoolPref(TOPSITES_PREF),
+    "Topsites are turned off"
+  );
+  Assert.ok(
+    Services.prefs.getBoolPref(HIGHLIGHTS_PREF),
+    "HIGHLIGHTS_PREF are on because they have been customized"
+  );
+  Assert.ok(
+    !Services.prefs.getBoolPref(TOPSTORIES_PREF),
+    "Topstories are turned off"
+  );
+});
diff --git a/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_default_browser.js b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_default_browser.js
new file mode 100644
index 0000000000..2d919456cd
--- /dev/null
+++ b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_default_browser.js
@@ -0,0 +1,22 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async function test_set_default_browser() {
+  const sandbox = sinon.createSandbox();
+  const stub = sandbox.stub();
+
+  await SMATestUtils.executeAndValidateAction(
+    { type: "SET_DEFAULT_BROWSER" },
+    {
+      ownerGlobal: {
+        getShellService: () => ({
+          setAsDefault: stub,
+        }),
+      },
+    }
+  );
+
+  Assert.equal(stub.callCount, 1, "setAsDefault was called by the action");
+});
diff --git a/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_default_pdf_handler.js b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_default_pdf_handler.js
new file mode 100644
index 0000000000..30c2229380
--- /dev/null
+++ b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_default_pdf_handler.js
@@ -0,0 +1,110 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async function test_set_default_pdf_handler_no_data() {
+  const sandbox = sinon.createSandbox();
+  const stub = sandbox.stub();
+
+  await SMATestUtils.executeAndValidateAction(
+    { type: "SET_DEFAULT_PDF_HANDLER" },
+    {
+      ownerGlobal: {
+        getShellService: () => ({
+          setAsDefaultPDFHandler: stub,
+        }),
+      },
+    }
+  );
+
+  Assert.equal(
+    stub.callCount,
+    1,
+    "setAsDefaultPDFHandler was called by the action"
+  );
+  Assert.ok(
+    stub.calledWithExactly(false),
+    "setAsDefaultPDFHandler called with onlyIfKnownBrowser = false"
+  );
+});
+
+add_task(async function test_set_default_pdf_handler_data_false() {
+  const sandbox = sinon.createSandbox();
+  const stub = sandbox.stub();
+
+  await SMATestUtils.executeAndValidateAction(
+    {
+      type: "SET_DEFAULT_PDF_HANDLER",
+      data: {
+        onlyIfKnownBrowser: false,
+      },
+    },
+    {
+      ownerGlobal: {
+        getShellService: () => ({
+          setAsDefaultPDFHandler: stub,
+        }),
+      },
+    }
+  );
+
+  Assert.equal(
+    stub.callCount,
+    1,
+    "setAsDefaultPDFHandler was called by the action"
+  );
+  Assert.ok(
+    stub.calledWithExactly(false),
+    "setAsDefaultPDFHandler called with onlyIfKnownBrowser = false"
+  );
+});
+
+add_task(async function test_set_default_pdf_handler_data_true() {
+  const sandbox = sinon.createSandbox();
+  const stub = sandbox.stub();
+
+  await SMATestUtils.executeAndValidateAction(
+    {
+      type: "SET_DEFAULT_PDF_HANDLER",
+      data: {
+        onlyIfKnownBrowser: true,
+      },
+    },
+    {
+      ownerGlobal: {
+        getShellService: () => ({
+          setAsDefaultPDFHandler: stub,
+        }),
+      },
+    }
+  );
+
+  Assert.equal(
+    stub.callCount,
+    1,
+    "setAsDefaultPDFHandler was called by the action"
+  );
+  Assert.ok(
+    stub.calledWithExactly(true),
+    "setAsDefaultPDFHandler called with onlyIfKnownBrowser = true"
+  );
+});
+
+add_task(async function test_decline_default_pdf_handler() {
+  registerCleanupFunction(() => {
+    Services.prefs.clearUserPref(
+      "browser.shell.checkDefaultPDF.silencedByUser"
+    );
+  });
+
+  await SMATestUtils.executeAndValidateAction({
+    type: "DECLINE_DEFAULT_PDF_HANDLER",
+  });
+
+  Assert.equal(
+    Services.prefs.getBoolPref("browser.shell.checkDefaultPDF.silencedByUser"),
+    true,
+    "DECLINE_DEFAULT_PDF_HANDLER ought to set pref properly."
+  );
+});
diff --git a/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_disable_doh.js b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_disable_doh.js
new file mode 100644
index 0000000000..aa61214360
--- /dev/null
+++ b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_disable_doh.js
@@ -0,0 +1,28 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+const DOH_DOORHANGER_DECISION_PREF = "doh-rollout.doorhanger-decision";
+const NETWORK_TRR_MODE_PREF = "network.trr.mode";
+
+add_task(async function test_disable_doh() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      [DOH_DOORHANGER_DECISION_PREF, "mochitest"],
+      [NETWORK_TRR_MODE_PREF, 0],
+    ],
+  });
+
+  await SMATestUtils.executeAndValidateAction({ type: "DISABLE_DOH" });
+
+  Assert.equal(
+    Services.prefs.getStringPref(DOH_DOORHANGER_DECISION_PREF, ""),
+    "UIDisabled",
+    "Pref should be set on disabled"
+  );
+  Assert.equal(
+    Services.prefs.getIntPref(NETWORK_TRR_MODE_PREF, 0),
+    5,
+    "Pref should be set on disabled"
+  );
+});
diff --git a/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_docs.js b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_docs.js
new file mode 100644
index 0000000000..cf2ec2c305
--- /dev/null
+++ b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_docs.js
@@ -0,0 +1,32 @@
+const TEST_URL =
+  "https://example.com/browser/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/index.md";
+
+function getHeadingsFromDocs(docs) {
+  const re = /### `(\w+)`/g;
+  const found = [];
+  let match = 1;
+  while (match) {
+    match = re.exec(docs);
+    if (match) {
+      found.push(match[1]);
+    }
+  }
+  return found;
+}
+
+add_task(async function test_sma_docs() {
+  let request = await fetch(TEST_URL);
+  let docs = await request.text();
+  let headings = getHeadingsFromDocs(docs);
+  const schemaTypes = (
+    await fetchSMASchema
+  ).definitions.SpecialMessageActionSchemas.anyOf.map(
+    s => s.properties.type.enum[0]
+  );
+  for (let schemaType of schemaTypes) {
+    Assert.ok(
+      headings.includes(schemaType),
+      `${schemaType} not found in SpecialMessageActionSchemas/index.md`
+    );
+  }
+});
diff --git a/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_handle_multiaction.js b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_handle_multiaction.js
new file mode 100644
index 0000000000..709f4515ad
--- /dev/null
+++ b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_handle_multiaction.js
@@ -0,0 +1,72 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async function test_handle_multi_action() {
+  const action = {
+    type: "MULTI_ACTION",
+    data: {
+      actions: [
+        {
+          type: "DISABLE_DOH",
+        },
+        {
+          type: "OPEN_AWESOME_BAR",
+        },
+      ],
+    },
+  };
+  const DOH_DOORHANGER_DECISION_PREF = "doh-rollout.doorhanger-decision";
+  const NETWORK_TRR_MODE_PREF = "network.trr.mode";
+
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      [DOH_DOORHANGER_DECISION_PREF, "mochitest"],
+      [NETWORK_TRR_MODE_PREF, 0],
+    ],
+  });
+
+  await SMATestUtils.executeAndValidateAction(action);
+
+  Assert.equal(
+    Services.prefs.getStringPref(DOH_DOORHANGER_DECISION_PREF, ""),
+    "UIDisabled",
+    "Pref should be set on disabled"
+  );
+  Assert.equal(
+    Services.prefs.getIntPref(NETWORK_TRR_MODE_PREF, 0),
+    5,
+    "Pref should be set on disabled"
+  );
+
+  Assert.ok(gURLBar.focused, "Focus should be on awesome bar");
+});
+
+add_task(async function test_handle_multi_action_with_invalid_action() {
+  const action = {
+    type: "MULTI_ACTION",
+    data: {
+      actions: [
+        {
+          type: "NONSENSE",
+        },
+      ],
+    },
+  };
+
+  await SMATestUtils.validateAction(action);
+
+  let error;
+  try {
+    await SpecialMessageActions.handleAction(action, gBrowser);
+  } catch (e) {
+    error = e;
+  }
+
+  ok(error, "should throw if an unexpected event is handled");
+  Assert.equal(
+    error.message,
+    "Error in MULTI_ACTION event: Special message action with type NONSENSE is unsupported."
+  );
+});
diff --git a/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_open_about_page.js b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_open_about_page.js
new file mode 100644
index 0000000000..264646bd0e
--- /dev/null
+++ b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_open_about_page.js
@@ -0,0 +1,34 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async function test_OPEN_ABOUT_PAGE() {
+  const tabPromise = BrowserTestUtils.waitForNewTab(
+    gBrowser,
+    "about:logins?foo=bar"
+  );
+  await SMATestUtils.executeAndValidateAction({
+    type: "OPEN_ABOUT_PAGE",
+    data: { args: "logins", entrypoint: "foo=bar", where: "tabshifted" },
+  });
+
+  const tab = await tabPromise;
+  ok(tab, "should open about page with entrypoint in a new tab by default");
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_OPEN_ABOUT_PAGE_NEW_WINDOW() {
+  const newWindowPromise = BrowserTestUtils.waitForNewWindow(
+    gBrowser,
+    "about:robots?foo=bar"
+  );
+  await SMATestUtils.executeAndValidateAction({
+    type: "OPEN_ABOUT_PAGE",
+    data: { args: "robots", entrypoint: "foo=bar", where: "window" },
+  });
+
+  const win = await newWindowPromise;
+  ok(win, "should open about page in a new window");
+  BrowserTestUtils.closeWindow(win);
+});
diff --git a/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_open_awesome_bar.js b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_open_awesome_bar.js
new file mode 100644
index 0000000000..62f7d8bb68
--- /dev/null
+++ b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_open_awesome_bar.js
@@ -0,0 +1,9 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async function test_OPEN_AWESOME_BAR() {
+  await SMATestUtils.executeAndValidateAction({ type: "OPEN_AWESOME_BAR" });
+  Assert.ok(gURLBar.focused, "Focus should be on awesome bar");
+});
diff --git a/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_open_private_browser_window.js b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_open_private_browser_window.js
new file mode 100644
index 0000000000..b6c933fbcf
--- /dev/null
+++ b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_open_private_browser_window.js
@@ -0,0 +1,17 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async function test_OPEN_PRIVATE_BROWSER_WINDOW() {
+  const newWindowPromise = BrowserTestUtils.waitForNewWindow();
+  await SMATestUtils.executeAndValidateAction({
+    type: "OPEN_PRIVATE_BROWSER_WINDOW",
+  });
+  const win = await newWindowPromise;
+  ok(
+    PrivateBrowsingUtils.isWindowPrivate(win),
+    "should open a private browsing window"
+  );
+  await BrowserTestUtils.closeWindow(win);
+});
diff --git a/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_open_protection_panel.js b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_open_protection_panel.js
new file mode 100644
index 0000000000..c9522426a2
--- /dev/null
+++ b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_open_protection_panel.js
@@ -0,0 +1,22 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async function test_OPEN_PROTECTION_PANEL() {
+  await BrowserTestUtils.withNewTab(EXAMPLE_URL, async browser => {
+    const popupshown = BrowserTestUtils.waitForEvent(
+      window,
+      "popupshown",
+      true,
+      e => e.target.id == "protections-popup"
+    );
+
+    await SMATestUtils.executeAndValidateAction({
+      type: "OPEN_PROTECTION_PANEL",
+    });
+
+    let { target: popupEl } = await popupshown;
+    Assert.equal(popupEl.state, "open", "Protections popup is open.");
+  });
+});
diff --git a/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_open_protection_report.js b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_open_protection_report.js
new file mode 100644
index 0000000000..3960075cd9
--- /dev/null
+++ b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_open_protection_report.js
@@ -0,0 +1,29 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async function test_OPEN_PROTECTION_REPORT() {
+  await BrowserTestUtils.withNewTab("about:blank", async browser => {
+    let loaded = BrowserTestUtils.browserLoaded(
+      browser,
+      false,
+      "about:protections"
+    );
+
+    await SMATestUtils.executeAndValidateAction({
+      type: "OPEN_PROTECTION_REPORT",
+    });
+
+    await loaded;
+
+    // When the graph is built it means any messaging has finished,
+    // we can close the tab.
+    await SpecialPowers.spawn(browser, [], async function () {
+      await ContentTaskUtils.waitForCondition(() => {
+        let bars = content.document.querySelectorAll(".graph-bar");
+        return bars.length;
+      }, "The graph has been built");
+    });
+  });
+});
diff --git a/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_open_spotlight_dialog.js b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_open_spotlight_dialog.js
new file mode 100644
index 0000000000..f3274c8aa5
--- /dev/null
+++ b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_open_spotlight_dialog.js
@@ -0,0 +1,38 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const { OnboardingMessageProvider } = ChromeUtils.importESModule(
+  "resource:///modules/asrouter/OnboardingMessageProvider.sys.mjs"
+);
+
+const { Spotlight } = ChromeUtils.importESModule(
+  "resource:///modules/asrouter/Spotlight.sys.mjs"
+);
+
+add_task(async function test_OPEN_SPOTLIGHT_DIALOG() {
+  let pbNewTabMessage = (
+    await OnboardingMessageProvider.getUntranslatedMessages()
+  ).filter(m => m.id === "PB_NEWTAB_FOCUS_PROMO");
+  info(`Testing ${pbNewTabMessage[0].id}`);
+  let showSpotlightStub = sinon.stub(Spotlight, "showSpotlightDialog");
+  await SMATestUtils.executeAndValidateAction({
+    type: "SHOW_SPOTLIGHT",
+    data: { ...pbNewTabMessage[0].content.promoButton.action.data },
+  });
+
+  Assert.equal(
+    showSpotlightStub.callCount,
+    1,
+    "Should call showSpotlightDialog"
+  );
+
+  Assert.deepEqual(
+    showSpotlightStub.firstCall.args[1],
+    pbNewTabMessage[0].content.promoButton.action.data,
+    "Should be called with action.data"
+  );
+
+  showSpotlightStub.restore();
+});
diff --git a/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_open_url.js b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_open_url.js
new file mode 100644
index 0000000000..876193b7ad
--- /dev/null
+++ b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_open_url.js
@@ -0,0 +1,33 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async function test_OPEN_URL() {
+  const action = {
+    type: "OPEN_URL",
+    data: { args: EXAMPLE_URL, where: "current" },
+  };
+  await BrowserTestUtils.withNewTab("about:blank", async browser => {
+    const loaded = BrowserTestUtils.browserLoaded(browser);
+    await SMATestUtils.executeAndValidateAction(action);
+    const url = await loaded;
+    Assert.equal(
+      url,
+      "https://example.com/",
+      "should open URL in the same tab"
+    );
+  });
+});
+
+add_task(async function test_OPEN_URL_new_tab() {
+  const action = {
+    type: "OPEN_URL",
+    data: { args: EXAMPLE_URL, where: "tab" },
+  };
+  const tabPromise = BrowserTestUtils.waitForNewTab(gBrowser, EXAMPLE_URL);
+  await SpecialMessageActions.handleAction(action, gBrowser);
+  const browser = await tabPromise;
+  ok(browser, "should open URL in a new tab");
+  BrowserTestUtils.removeTab(browser);
+});
diff --git a/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_pin_current_tab.js b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_pin_current_tab.js
new file mode 100644
index 0000000000..4425325526
--- /dev/null
+++ b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_pin_current_tab.js
@@ -0,0 +1,14 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async function test_PIN_CURRENT_TAB() {
+  await BrowserTestUtils.withNewTab("about:blank", async browser => {
+    await SMATestUtils.executeAndValidateAction({ type: "PIN_CURRENT_TAB" });
+
+    ok(gBrowser.selectedTab.pinned, "should pin current tab");
+
+    gBrowser.unpinTab(gBrowser.selectedTab);
+  });
+});
diff --git a/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_pin_firefox.js b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_pin_firefox.js
new file mode 100644
index 0000000000..09714e6703
--- /dev/null
+++ b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_pin_firefox.js
@@ -0,0 +1,72 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const isWin = AppConstants.platform == "win";
+const isMac = AppConstants.platform == "macosx";
+
+add_task(async function test_PIN_FIREFOX_TO_TASKBAR() {
+  const sandbox = sinon.createSandbox();
+  let shell = {
+    async checkPinCurrentAppToTaskbarAsync() {},
+    QueryInterface: () => shell,
+    get macDockSupport() {
+      return this;
+    },
+    get shellService() {
+      return this;
+    },
+
+    ensureAppIsPinnedToDock: sandbox.stub(),
+    isCurrentAppPinnedToTaskbarAsync: sandbox.stub(),
+    pinCurrentAppToTaskbarAsync: sandbox.stub().resolves(undefined),
+    isAppInDock: false,
+  };
+
+  // Prefer the mocked implementation and fall back to the original version,
+  // which can call back into the mocked version (via this.shellService).
+  shell = new Proxy(shell, {
+    get(target, prop) {
+      return (prop in target ? target : ShellService)[prop];
+    },
+  });
+
+  const test = () =>
+    SMATestUtils.executeAndValidateAction(
+      { type: "PIN_FIREFOX_TO_TASKBAR" },
+      {
+        ownerGlobal: {
+          getShellService: () => shell,
+        },
+      }
+    );
+
+  await test();
+
+  function check(count, message) {
+    Assert.equal(
+      shell.pinCurrentAppToTaskbarAsync.callCount,
+      count * isWin,
+      `pinCurrentAppToTaskbarAsync was ${message} by the action for windows`
+    );
+    Assert.equal(
+      shell.ensureAppIsPinnedToDock.callCount,
+      count * isMac,
+      `ensureAppIsPinnedToDock was ${message} by the action for not windows`
+    );
+  }
+  check(1, "called");
+
+  // Pretend the app is already pinned.
+  shell.isCurrentAppPinnedToTaskbarAsync.resolves(true);
+  shell.isAppInDock = true;
+  await test();
+  check(1, "not called");
+
+  // Pretend the app became unpinned.
+  shell.isCurrentAppPinnedToTaskbarAsync.resolves(false);
+  shell.isAppInDock = false;
+  await test();
+  check(2, "called again");
+});
diff --git a/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_pin_private_firefox.js b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_pin_private_firefox.js
new file mode 100644
index 0000000000..90880edd27
--- /dev/null
+++ b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_pin_private_firefox.js
@@ -0,0 +1,78 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async function test_PIN_PRIVATE_FIREFOX_TO_TASKBAR() {
+  const sandbox = sinon.createSandbox();
+  let shell = {
+    async checkPinCurrentAppToTaskbarAsync() {},
+    QueryInterface: () => shell,
+    get macDockSupport() {
+      return this;
+    },
+    get shellService() {
+      return this;
+    },
+
+    ensureAppIsPinnedToDock: sandbox.stub(),
+    isCurrentAppPinnedToTaskbarAsync: sandbox.stub(),
+    pinCurrentAppToTaskbarAsync: sandbox.stub().resolves(undefined),
+    isAppInDock: false,
+  };
+
+  // Prefer the mocked implementation and fall back to the original version,
+  // which can call back into the mocked version (via this.shellService).
+  shell = new Proxy(shell, {
+    get(target, prop) {
+      return (Object.hasOwn(target, prop) ? target : ShellService)[prop];
+    },
+  });
+
+  const test = () =>
+    SMATestUtils.executeAndValidateAction(
+      {
+        type: "PIN_FIREFOX_TO_TASKBAR",
+        data: {
+          privatePin: true,
+        },
+      },
+      {
+        ownerGlobal: {
+          getShellService: () => shell,
+        },
+      }
+    );
+
+  await test();
+
+  function check(count, message, arg) {
+    Assert.equal(
+      shell.pinCurrentAppToTaskbarAsync.callCount,
+      count,
+      `pinCurrentAppToTaskbarAsync was ${message} by the action for windows`
+    );
+    if (arg) {
+      Assert.equal(
+        shell.pinCurrentAppToTaskbarAsync.calledWith(arg),
+        true,
+        `pinCurrentAppToTaskbarAsync was ${message} with the arg: ${JSON.stringify(
+          arg
+        )}`
+      );
+    }
+  }
+  check(1, "called", true);
+
+  // Pretend the app is already pinned.
+  shell.isCurrentAppPinnedToTaskbarAsync.resolves(true);
+  shell.isAppInDock = true;
+  await test();
+  check(1, "not called");
+
+  // Pretend the app became unpinned.
+  shell.isCurrentAppPinnedToTaskbarAsync.resolves(false);
+  shell.isAppInDock = false;
+  await test();
+  check(2, "called again", true);
+});
diff --git a/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_set_prefs.js b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_set_prefs.js
new file mode 100644
index 0000000000..3d408192b6
--- /dev/null
+++ b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_set_prefs.js
@@ -0,0 +1,167 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const HOMEPAGE_PREF = "browser.startup.homepage";
+const PRIVACY_SEGMENTATION_PREF = "browser.dataFeatureRecommendations.enabled";
+const MESSAGING_ACTION_PREF = "special-message-testpref";
+
+const PREFS_TO_CLEAR = [
+  HOMEPAGE_PREF,
+  PRIVACY_SEGMENTATION_PREF,
+  `messaging-system-action.${MESSAGING_ACTION_PREF}`,
+];
+
+add_setup(async function () {
+  registerCleanupFunction(async () => {
+    PREFS_TO_CLEAR.forEach(pref => Services.prefs.clearUserPref(pref));
+  });
+});
+
+add_task(async function test_set_privacy_segmentation_pref() {
+  const action = {
+    type: "SET_PREF",
+    data: {
+      pref: {
+        name: PRIVACY_SEGMENTATION_PREF,
+        value: true,
+      },
+    },
+  };
+
+  Assert.ok(
+    !Services.prefs.prefHasUserValue(PRIVACY_SEGMENTATION_PREF),
+    "Test setup ok"
+  );
+
+  await SMATestUtils.executeAndValidateAction(action);
+
+  Assert.ok(
+    Services.prefs.getBoolPref(PRIVACY_SEGMENTATION_PREF),
+    `${PRIVACY_SEGMENTATION_PREF} pref successfully updated`
+  );
+});
+
+add_task(async function test_clear_privacy_segmentation_pref() {
+  Services.prefs.setBoolPref(PRIVACY_SEGMENTATION_PREF, true);
+  Assert.ok(
+    Services.prefs.prefHasUserValue(PRIVACY_SEGMENTATION_PREF),
+    "Test setup ok"
+  );
+
+  const action = {
+    type: "SET_PREF",
+    data: {
+      pref: {
+        name: PRIVACY_SEGMENTATION_PREF,
+      },
+    },
+  };
+
+  await SMATestUtils.executeAndValidateAction(action);
+
+  Assert.ok(
+    !Services.prefs.prefHasUserValue(PRIVACY_SEGMENTATION_PREF),
+    `${PRIVACY_SEGMENTATION_PREF} pref successfully cleared`
+  );
+});
+
+add_task(async function test_set_homepage_pref() {
+  const action = {
+    type: "SET_PREF",
+    data: {
+      pref: {
+        name: HOMEPAGE_PREF,
+        value: "https://foo.example.com",
+      },
+    },
+  };
+
+  Assert.ok(!Services.prefs.prefHasUserValue(HOMEPAGE_PREF), "Test setup ok");
+
+  await SMATestUtils.executeAndValidateAction(action);
+
+  Assert.equal(
+    Services.prefs.getStringPref(HOMEPAGE_PREF),
+    "https://foo.example.com",
+    `${HOMEPAGE_PREF} pref successfully updated`
+  );
+});
+
+add_task(async function test_clear_homepage_pref() {
+  Services.prefs.setStringPref(HOMEPAGE_PREF, "https://www.example.com");
+  Assert.ok(Services.prefs.prefHasUserValue(HOMEPAGE_PREF), "Test setup ok");
+
+  const action = {
+    type: "SET_PREF",
+    data: {
+      pref: {
+        name: HOMEPAGE_PREF,
+      },
+    },
+  };
+
+  await SMATestUtils.executeAndValidateAction(action);
+
+  Assert.ok(
+    !Services.prefs.prefHasUserValue(HOMEPAGE_PREF),
+    `${HOMEPAGE_PREF} pref successfully updated`
+  );
+});
+
+// Set a pref not listed in "allowed prefs"
+add_task(async function test_set_messaging_system_pref() {
+  const action = {
+    type: "SET_PREF",
+    data: {
+      pref: {
+        name: MESSAGING_ACTION_PREF,
+        value: true,
+      },
+    },
+  };
+
+  await SMATestUtils.executeAndValidateAction(action);
+
+  Assert.equal(
+    Services.prefs.getBoolPref(
+      `messaging-system-action.${MESSAGING_ACTION_PREF}`
+    ),
+    true,
+    `messaging-system-action.${MESSAGING_ACTION_PREF} pref successfully updated to correct value`
+  );
+});
+
+// Clear a pref not listed in "allowed prefs" that was initially set by
+// the SET_PREF special messaging action
+add_task(async function test_clear_messaging_system_pref() {
+  Services.prefs.setBoolPref(
+    `messaging-system-action.${MESSAGING_ACTION_PREF}`,
+    true
+  );
+  Assert.ok(
+    Services.prefs.prefHasUserValue(
+      `messaging-system-action.${MESSAGING_ACTION_PREF}`
+    ),
+    "Test setup ok"
+  );
+
+  const action = {
+    type: "SET_PREF",
+    data: {
+      pref: {
+        name: MESSAGING_ACTION_PREF,
+      },
+    },
+  };
+
+  await SMATestUtils.executeAndValidateAction(action);
+
+  Assert.ok(
+    !Services.prefs.prefHasUserValue(
+      `messaging-system-action.${MESSAGING_ACTION_PREF}`
+    ),
+    `messaging-system-action.${MESSAGING_ACTION_PREF} pref successfully cleared`
+  );
+});
diff --git a/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_show_firefox_accounts.js b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_show_firefox_accounts.js
new file mode 100644
index 0000000000..82bba359a3
--- /dev/null
+++ b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_show_firefox_accounts.js
@@ -0,0 +1,66 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Note: "identity.fxaccounts.remote.root" is set to https://example.com in browser.ini
+add_task(async function test_SHOW_FIREFOX_ACCOUNTS() {
+  await BrowserTestUtils.withNewTab("about:blank", async browser => {
+    let loaded = BrowserTestUtils.browserLoaded(browser);
+    await SMATestUtils.executeAndValidateAction({
+      type: "SHOW_FIREFOX_ACCOUNTS",
+      data: { entrypoint: "snippets" },
+    });
+    Assert.equal(
+      await loaded,
+      "https://example.com/?context=fx_desktop_v3&entrypoint=snippets&action=email&service=sync",
+      "should load fxa with endpoint=snippets"
+    );
+
+    // Open a URL
+    loaded = BrowserTestUtils.browserLoaded(browser);
+    await SMATestUtils.executeAndValidateAction({
+      type: "SHOW_FIREFOX_ACCOUNTS",
+      data: { entrypoint: "aboutwelcome" },
+    });
+
+    Assert.equal(
+      await loaded,
+      "https://example.com/?context=fx_desktop_v3&entrypoint=aboutwelcome&action=email&service=sync",
+      "should load fxa with a custom endpoint"
+    );
+
+    // Open a URL with extra parameters
+    loaded = BrowserTestUtils.browserLoaded(browser);
+    await SMATestUtils.executeAndValidateAction({
+      type: "SHOW_FIREFOX_ACCOUNTS",
+      data: { entrypoint: "test", extraParams: { foo: "bar" } },
+    });
+
+    Assert.equal(
+      await loaded,
+      "https://example.com/?context=fx_desktop_v3&entrypoint=test&action=email&service=sync&foo=bar",
+      "should load fxa with a custom endpoint and extra parameters in url"
+    );
+  });
+
+  add_task(async function test_SHOW_FIREFOX_ACCOUNTS_where() {
+    // Open FXA with a 'where' prop
+    const action = {
+      type: "SHOW_FIREFOX_ACCOUNTS",
+      data: {
+        entrypoint: "activity-stream-firstrun",
+        where: "tab",
+      },
+    };
+    const tabPromise = BrowserTestUtils.waitForNewTab(
+      gBrowser,
+      "https://example.com/?context=fx_desktop_v3&entrypoint=activity-stream-firstrun&action=email&service=sync"
+    );
+
+    await SpecialMessageActions.handleAction(action, gBrowser);
+    const browser = await tabPromise;
+    ok(browser, "should open FXA in a new tab");
+    BrowserTestUtils.removeTab(browser);
+  });
+});
diff --git a/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_show_migration_wizard.js b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_show_migration_wizard.js
new file mode 100644
index 0000000000..4efbabfe3c
--- /dev/null
+++ b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/browser_sma_show_migration_wizard.js
@@ -0,0 +1,39 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_setup(async () => {
+  // Load the initial tab at example.com. This makes it so that if
+  // when loading the migration wizard in about:preferences, we'll
+  // load the about:preferences page in a new tab rather than overtaking
+  // the initial one. This makes cleanup of that opened tab more explicit.
+  let browser = gBrowser.selectedBrowser;
+  BrowserTestUtils.startLoadingURIString(browser, "https://example.com");
+  await BrowserTestUtils.browserLoaded(browser);
+});
+
+add_task(async function test_SHOW_MIGRATION_WIZARD() {
+  let wizardOpened = BrowserTestUtils.waitForMigrationWizard(window);
+
+  await SMATestUtils.executeAndValidateAction({
+    type: "SHOW_MIGRATION_WIZARD",
+  });
+
+  let wizard = await wizardOpened;
+  ok(wizard, "Migration wizard opened");
+  await BrowserTestUtils.removeTab(wizard);
+});
+
+add_task(async function test_SHOW_MIGRATION_WIZARD_WITH_SOURCE() {
+  let wizardOpened = BrowserTestUtils.waitForMigrationWizard(window);
+
+  await SMATestUtils.executeAndValidateAction({
+    type: "SHOW_MIGRATION_WIZARD",
+    data: { source: "chrome" },
+  });
+
+  let wizard = await wizardOpened;
+  ok(wizard, "Migrator window opened when source param specified");
+  await BrowserTestUtils.removeTab(wizard);
+});
diff --git a/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/head.js b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/head.js
new file mode 100644
index 0000000000..7d77a80ee0
--- /dev/null
+++ b/toolkit/components/messaging-system/schemas/SpecialMessageActionSchemas/test/browser/head.js
@@ -0,0 +1,62 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const { sinon } = ChromeUtils.importESModule(
+  "resource://testing-common/Sinon.sys.mjs"
+);
+const { JsonSchema } = ChromeUtils.importESModule(
+  "resource://gre/modules/JsonSchema.sys.mjs"
+);
+
+ChromeUtils.defineESModuleGetters(this, {
+  SpecialMessageActions:
+    "resource://messaging-system/lib/SpecialMessageActions.sys.mjs",
+});
+
+ChromeUtils.defineLazyGetter(this, "fetchSMASchema", async () => {
+  const response = await fetch(
+    "resource://testing-common/SpecialMessageActionSchemas.json"
+  );
+  const schema = await response.json();
+  if (!schema) {
+    throw new Error("Failed to load SpecialMessageActionSchemas");
+  }
+  return schema;
+});
+
+const EXAMPLE_URL = "https://example.com/";
+
+const SMATestUtils = {
+  /**
+   * Checks if an action is valid acording to existing schemas
+   * @param {SpecialMessageAction} action
+   */
+  async validateAction(action) {
+    const schema = await fetchSMASchema;
+    const result = JsonSchema.validate(action, schema);
+    if (result.errors.length) {
+      throw new Error(
+        `Action with type ${
+          action.type
+        } was not valid. Errors: ${JSON.stringify(result.errors, undefined, 2)}`
+      );
+    }
+    is(
+      result.errors.length,
+      0,
+      `Should be a valid action of type ${action.type}`
+    );
+  },
+
+  /**
+   * Executes a Special Message Action after validating it
+   * @param {SpecialMessageAction} action
+   * @param {Browser} browser
+   */
+  async executeAndValidateAction(action, browser = gBrowser) {
+    await SMATestUtils.validateAction(action);
+    await SpecialMessageActions.handleAction(action, browser);
+  },
+};