Incredible!

This extension is very useful - it enables setting a custom title bar specific to Firefox profiles.

In Linux/Plasma/KDE, the window titlebar colors can therefore be customized through matching the window title (Window Management --> Window Rules --> Window title Substring Match/ Appearance and fixes)

Really nice for those like me who keep many windows open.

Does exactly as described. Super handy for someone like myself that works with a project per window.

Very useful if you run Firefox using multiple browser profiles, this add-on tells me the name of the profile being used by the open window! Perfect! Thanks, much appreciated!

Yep, exactly what I was looking for. This is a very creative, unobtrusive extension. Thanks for your work and for keeping it thriving over the years.

You have no idea how much this helps. Firstly it is responsibility of Firefox to add window re-ordering and changing titles. Such a obvious basic thing. I can't thank you enough for this!!!!!!!!!!

This add-on does one thing and it does it well. I wish this were part of the core firefox capability but it is not.

This add-on is a very simple and user-friendly way to get powerful labeling of your windows, so you can go straight to the one you want without having to remember which last-focused tab's title corresponds to the window you want.

Especially useful if you have a lot of windows and tabs and want to group tabs together by related content in certain windows.

Does exactly what it says on the tin. Very useful if you work with multiple windows.

This is exactly what I'm looking for! It names the Firefox window title! Works perfectly fine!

Perfect. Especially love that it supports emojis. ♥

AUTHOR PLEASE READ SUGGESTION
You NEED We NEED World NEEDS
you to add the word "RENAME" prominently so it shows up on the search: "Rename Window" -
Missed this since I switched 'puters. Works great. Occasionally goes tilt - don't panic - restart FF.

Combined with KDE's "Activities", and the "Simple tab groups" extension, and a few other things not related to FX, this extension finally allows me to have multiple "workspaces" all easily distinguishable.
Thanks!

Simple and to the point. No bloat and excellent add on.