Дополнения

Password Exporter от Justin Scott (fligtar), Jorge Villalobos

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.

Примечание подборщика ▶ Save your Password to add them to your new profile

ProfileSwitcher от Paolo "Kaosmos"

It adds some options to launch easily other profiles and the Profile Manager.

Примечание подборщика ▶ Must have when you use multi Profile

about:addons-memory от Nils Maier

Adds an about:addons-memory page that details add-on memory usage

Addons Manager Hilite от custom.firefox.lady

Remembers last selected (hilited) extension/theme/plugin/userstyle in Add-ons Manager. Version 3.0 also includes sorting buttons. Turn off/on the add-on selection list box and/or fine tune behavior via its Options.

BBCodeXtra от flod

(Sorry, no plans to port this add-on to Webextensions)
BBCodeXtra is an extension, compatible with Mozilla FireFox (up to 57) and Seamonkey, which adds to the context menu new commands to insert BBCode/Html/XHtml codes in an easy and fast way...

Примечание подборщика ▶ To format your text (htlm/bbcode etc)