Yes.
Hot tip. You can enable ‘Install extension from file’ in mobile Firefox apps (Firefox, Fennec, Mull etc) by going to Settings > About Firefox (or About Fennec etc) > Tapping the name 5 times.
You should see a message about debug mode being enabled and the ‘Install extention from file’ option should be in the Advanced section of your brower settings.
The females are turning! The females are turning I tell you!