الإضافات

The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of a browser.

This add-on allows you to export your saved passwords and disabled login hosts using XML or CSV files that can be imported later.

Note: This add-on won't work in Firefox 57. It may eventually if the APIs to access passwords are implemented.

Русский словарь проверки орфографии

View HTTP headers of a page and while browsing.