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Unfortunately, Firefox on Android seems to have a bug where it only allows one tab to intercept the custom URI scheme handler for our auth redirect. This causes an issue where the first sign in works, but subsequent ones do not because that first tab is still open. Luckily the fix here is quite simple. By using Android's CustomTabs to launch the activity, only one, sandboxed instance is ever open and the URI intercept works reliably. Both Firefox and Chrome (and likely other browsers) support CustomTabs, which means the user's default browser is used, allowing cookies, password managers, etc to be used. Related to this, this PR also fixes a bug where dismissing the launched auth flow would result in it immediately relaunching, making it impossible to get back to the app unless you force quit or complete the sign in process. Fixes #10318