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There is the "activeTab" permission: https://developer.mozilla.org/en-US/Add-ons/WebExtensions/manifest.json/permissions#activeTab_permission https://developer.

• Rumperuu 8y ago
  It looks like that can only be triggered if the user interacts with the extension in some way. Presumably, then, it won't work if there's a script that should run on each page load. EDIT: I had a look at the manifest.json[1], and it turns out that's the only permission I've requested. Not sure why Firefox says I'm asking for everything and the kitchen sink. [1] https://github.com/Rumperuu/Pinpointer/blob/master/manifest.json https://github.com/Rumperuu/Pinpointer/blob/master/manifest....