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Change tab titles easily! + Persists through sessions + Domain level re-titling + Regex replacements and much more!

Simply click on the icon to rename the tab title.
Features:

• Persistent throughout multiple sessions!
• Titles saved across devices (under the same account)!
• Domain-level titles!
• Option to set a temporary title!
• Option to lock the title to a tab! As long as you don't close the tab, the title remains the same.
• Keyboard shortcut with Alt + SHIFT + X
• Context menu option!
• Use saved bookmarks' titles!
• Prefix the original titles! (Using $0 inserts the old title)

Beta features: (Might not work perfectly)

• Regex capture & replacements
• Regex URL matching and captures

Support Discussion:
https://discourse.mozilla.org/t/support-tab-re-title-general-support/28395

Known Issues:

• The old title replacement $0 breaks when the title is changed by the website. e.g. Getting a message on Facebook.
  Temporary Fix: Don't use $0 for websites that updates titles.
• [Windows] The popup won't auto focus when clicked. This is a Firefox bug.
  Temporary fix: https://bugzilla.mozilla.org/show_bug.cgi?id=1324255
• [For FF60 and up] PDF pages cannot change titles, due to firefox not allowing add-ons to interact with the PDF viewer.
  Temporary fix:Use FF 59 or lower, or use Google Chrome as it can still change PDF pages.

IMPORTANT NOTE:
This doesn't work on *mozilla.org* websites, reader view, and PDF pages as FIrefox disables add-ons for security reasons.