Awesome

webext-inject-on-install

Automatically add content scripts to existing tabs when your extension is installed.

Firefox actually already does this natively, so this module is automatically disabled there.

Browsers: Chrome, Firefox, and Safari
Manifest: v2 and v3
Permissions: tabs + explicit host permissions in permissions; in Manifest v3 you'll also need scripting
Context: background

Sponsored by PixieBrix :tada:

npm install webext-inject-on-install

Or download the standalone bundle to include in your manifest.json.

It registers automatically:

import "webext-inject-on-install";

It gets the list of content scripts from the manifest
For each content script group, it looks for open tabs that are not discarded (discarded tabs are already handled by the browser)
It injects the script into the tabs matching the matches patterns (exclude_matches is not supported https://github.com/fregante/webext-dynamic-content-scripts/issues/5)
If the tab count exceeds 10 (each), it injects into the tabs only when they become active. (persistent background pages only https://github.com/fregante/webext-dynamic-content-scripts/issues/4)

webext-dynamic-content-scripts - Automatically registers your content_scripts on domains added via permission.request
webext-content-scripts - Utility functions to inject content scripts in WebExtensions.
webext-options-sync - Helps you manage and autosave your extension's options.
More…