Bugzilla

Note that muting is temporary, whereas revoking permission permanently ends those video tracks, leaving the page unable to resume without re-asking for permission when it comes back into foreground, which will be denied until the page is navigated/reloaded.

I think there are three things we should do here:
 1. Temporarily mute/unmute camera's video track(s) when app goes into/out of background, for parity with Chrome for Android. Test it [here](https://jan-ivar.github.io/dummy/gum_events.html).
 2. When users click on the _"📹 Firefox Nightly: Camera and microphone are on"_ notification, take them to the (first) offending tab (like Desktop does in response to clicks on our privacy indicators somewhere on the user's desktop),
3. 2 + when users click on the _"📹 Firefox Nightly: Camera and microphone are on"_ notification, pop up page info UX for the tab the user is taken to (e.g. like clicking 🔒 in url on Desktop) where they can quickly revoke that page's camera+mic permissions.

For #1 we need to expose a platform API to mute/unmute all camera tracks, since nothing does that yet AFAIK.
For #3 can we reuse the platform API Desktop [uses to revoke permission](https://searchfox.org/mozilla-central/rev/89814940895946b48b4c04c702efd2c676ec8e7e/browser/base/content/browser-siteIdentity.js#1642,1651) from 🔒 in the url bar?

Note that muting is temporary, whereas revoking permission permanently ends those video tracks, leaving the page unable to resume without re-asking for permission when it comes back into foreground, which will be denied until the page is navigated/reloaded.

I think there are three things we should do here:
 1. Temporarily mute/unmute camera's video track(s) when app goes into/out of background, for parity with Chrome for Android. Test it [here](https://jan-ivar.github.io/dummy/gum_events.html).
 2. When users click on the _"📹 Firefox Nightly: Camera and microphone are on"_ notification, take them to the (first) offending tab (like Desktop does in response to clicks on our privacy indicators somewhere on the user's desktop),
3. 2 + when users click on the _"📹 Firefox Nightly: Camera and microphone are on"_ notification, pop up page info UX for the tab the user is taken to (e.g. like clicking 🔒 in url on Desktop) where they can quickly revoke that page's camera+mic permissions.

For #1 we need to expose a platform API to mute/unmute all camera tracks, since nothing does that yet AFAIK.
For #3 can we reuse the platform API Desktop [uses to revoke permission](https://searchfox.org/mozilla-central/rev/89814940895946b48b4c04c702efd2c676ec8e7e/browser/base/content/browser-siteIdentity.js#1642,1651) (which uses [this](https://searchfox.org/mozilla-central/search?q=getUserMedia%3Arevoke&case=true&path=)) from 🔒 in the url bar?