Warn about multiple MetaMask instances running (#13836)
* Add text warning on startup page
* Try to detect extensions with browser API
* Setup messaging between different versions of extension
* Cleanup
* Cleanup
* Simplify check for multiple instances running
* Fix a doc string + use webextension-polyfill
* Fix test
* Mock webextension-polyfill
* Mock correctly
* Catch error and show warning in both extensions
* Mock as promise
* Address comments
* Rename build ids
* Run detection code only if Chrome
* Add Firefox warnings
* Cleanup imports
* Update connection ids
* Run detection code for Firefox
* Add test
* Add missing await
* Update tests
* Cleanup
* Cleanup
* Improve testing
* Improve tests
* Log errors from sendMessage
* Cleanup
Co-authored-by: Frederik Bolding <frederik.bolding@gmail.com>
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