Bugzilla

### Background

Once upon a time, in [Firefox 3](https://bugzilla.mozilla.org/show_bug.cgi?id=398434), we added this feature. Then, in [Firefox 31](https://bugzilla.mozilla.org/show_bug.cgi?id=432017) we removed it. The original issue that caused us to remove this feature had to do with multiple installations. Now that we have per-installation profiles, this is something we should be able to re-implement.

Not allowing users to do this can be problematic for users who want to fully remove their Firefox data from a machine. While it's a potentially destructive action for users who are uninstalling to fix a problem, it's something that we should provide to users who wish to fully remove their data from a machine.

### Requirements

* Allow users to optionally remove their profile data when uninstalling Firefox using the Windows uninstaller.
* This option should not be the default, and should be clearly marked as a potentially destructive action.

### Background

Once upon a time, in [Firefox 3](https://bugzilla.mozilla.org/show_bug.cgi?id=398434), we added this feature. Then, in [Firefox 31](https://bugzilla.mozilla.org/show_bug.cgi?id=432017) we removed it. The original issue that caused us to remove this feature had to do with multiple installations. Now that we have per-installation profiles, this is something we should be able to re-implement.

Not allowing users to do this can be problematic for users who want to fully remove their Firefox data from a machine. While it's a potentially destructive action for users who are uninstalling to fix a problem, it's something that we should provide to users who wish to fully remove their data from a machine.

### Requirements

* Allow users to optionally remove their profile data when uninstalling Firefox using the Windows uninstaller.
* This option should not be the default, and should be clearly marked as a potentially destructive action.

### Nice to haves

* Telemetry to track percentage of uninstalls that enable this.