It appears to work, but it has five problems which are pretty major, given what a large portion of the addon they are.

1. The Ctrl+Shift+E shortcut already HAS a use. It opens up the network panel in the developer tools... and, here on Linux, Firefox doesn't allow extensions to override built-in hotkeys. (See Bugzilla bug # 1325692. I actually wrote a utility which intercepts Ctrl+Q when Firefox is the active window to work around this shortcoming.)

2. Cluttering up either my toolbar or my overflow menu using a browser action is awkward and bad UI design. The proper way to implement a function like this is to add it to the tab context menu using browser.menus.create and the "tab" context type. (Because of a limitation in the WebExtensions API, Tree Style Tab can't query custom tab context menu entries, so you'll also want to use the code snippet from the "API for other addons" page in the Tree Style Tab wiki to register yourself with Tree Style Tab's context menu.)

3. The popup looks terrible. If you're going to use a browser-provided popup panel, please set browser_style to true when declaring it, so Firefox will inject the same CSS rules used for things like the bookmark star. The "Browser styles" page in the MDN WebExtensions documentation has more information.

4. I use a tab suspender addon to keep memory consumption down and using a browser action means that I have to load a tab back into memory in order to edit its title. (Which means I have to wait for the tab to reload because, while the current tab is in the process of loading or reloading, Rename Tab Title will just see "undefined" as the current title.) Using a context menu entry would allow me to rename unloaded tabs without reloading them first.

5. Drag-and-drop reordering tabs using Tree Style Tab's sidebar sometimes unsets the customized tab title. (eg. I experienced it on a tab containing my GOG.com friends list, which only has "GOG.com" as its title.)

What I'd do is:

a. Register a context menu entry for tabs with both Firefox and Tree Style Tab (be sure to use the example code, so it silences any "Could not send a message to Tree Style Tab because it's not installed" errors.) and have it display an ordinary window.prompt popup. (The alternative is to inject content into the site, which is fragile and takes a lot of work to make it consistently look nice.)

b. Have the browser action take users directly to the Edit All option. (Browser actions are supposed to be for things which are not specific to the current tab's contents, like NoScript or uMatrix policies which apply to entire domains, or in-progress downloads which have lifetimes independent of specific tabs.)

c. Identify why the drag-and-drop reordering breaks things and fix it. (Worst case scenario, maybe there's a Tree Style Tabs event you can attach to.)

EDIT: I dropped the rating down to one star because it seems to consistently forget the customization when the page gets reloaded after the tab's been suspended. That makes it effectively useless to me.

I first thought WHY!
Then fell in love seconds later :D

not working..

Excellent add! So handy to rename cryptic server urls in titles
Would you mind adding an entry on the tab header menu as well? Thanks

Thanks! Now I can distinguish tabs with similar names. :)

I didn't know I could start typing right after clicking the extension icon. The caret isn't visible until I press a key for some reason. Anyway, autofocus works, it's fine.

Firefox 61.0.1 (64-bit) on Windows 10.

Very basic, doesnt permanently rename tabs like tab retitle, but that malfunctions so back to this.
being able to edit the previous name in the box is great, saves a lot of hassle.

Shortcut suggestion: Alt_m.
Reason: ShiftControl_E doesn't work, it opens the firefox debugger! And of course m is the letter to press to rename in windows explorer, so is easy to remember. :-)

Doesnt work

Simple and honest.

feature request/
import and export of saved renamed tab titles
/feature request
every time i update my FF, all saved tab titles are gone. that's annoying (i'm using the portable version of FF).
please continue the good work on this addon. thx.

Works perfectly for me

Below there are some comments that amount to this extension being "inflexible" because it won't work on a global basis but only on individual tabs. The extension is called "Rename Tab Title" and that is exactly what it does. If it renamed every tab from a particular site to exactly the same tab title it would be of no value to me and would indeed be "inflexible". The whole point, surely, is to pinpoint a specific url by a chosen name.
It works just fine (does what it says on tin).

Agree with blake below. Lots of URIs change slightly on every logout/login to the service by changing GET parameters like ?sessionid= or path.

[HOTPATCH] The easiest way would be to only check that many characters that are stored in storage.js[/HOTPATCH]

[FIX] More advanced would be to include wildcards or regex[/FIX]

[FEATURE REQUEST] Another idea would be to sync with bookmark name if the URL is bookmarked! That would make it to a whole new level but that's probably far beyond the scope. [/FEATURE REQUEST]

Thanks for a good add-on anyway!

This is no longer working properly for me - the tab title disappears once the tab is closed. So my bookmarks revert to their original tab titles. Hope this can be fixed as it was really helpful before!

Works for me on Firefox 58.0.1 but icon in toolbar is almost invisible. It is very light gray on white background on my system. If I knew where to find the icon I might be able to edit it for more contrast.

Didn't work for my use case. :( The reason I wanted this extension is to make my Tumbr tab stay named "Tumblr" instead of changing to "(3) Tumblr" etc every time I had some unread posts. Sadly this doesn't seem to work: initially the "(3) Tumblr" did become "Tumblr" when I renamed it, but then a few minutes later it became "(2) Tumblr" again after some unread posts appeared. Could you please make the tab-renaming persistent even if the website tries to change the tab title?

Extension is working good but i do have a suggestion/Feature,
It should be able to handle domain names, currently it only renames individual tabs from a site.
e.g www.abc.com/xyz (renamed as) ----> AB
www.abc.com/qwerty (should also retain the name) ----> AB

Thanks & Cheers.

Does not work. I enter custom name, hit save, tab keeps old name, nothing happens.
Also if this will ever get to work it needs to be accessed from the tab context menu, not from a toolbar.

Using Windows 10 Pro v1703 and Firefox Developer Edition v58.0b11 (64-bit) the extension works as claimed. Not only did it remember the renamed tab between sessions, it remembered it after a computer reboot.

It's simple, but it does what it made for.

A good start, but a long way to go to truly make this extension useful. Need the ability to rename tabs based on rules (wildcards or complete URL's). Also, after renaming tab, it is not persistent.

Hopefully, I'll come back when the feature set is more mature like Tab Modifier (Chrome) or Tab Mix Plus was before the latest version of Firefox.

Appreciate the effort.

If you would allow wildcard searching for the URL this would be legendary! Thank you for your hard work and dedication!

Far too inflexible to be broadly useful: it filters based only on fully qualified URLs and has no support for Regular Expressions or wildcards of any sort. This means that it can only match per specific page, not per domain nor even sub-domain.

Example of what won't work: If a site uses text in its site-wide page titleing that causes problems, you cannot filter out the offending text for the title of every page on a site with just one rule; you would be forced to visit every page of the site and create separate rules for each one. If you like to save copies of Web page, as I do, and a site for instance uses the Unicode character "→" in place of a dash in page titles, you would want a single filter for the entire site - perhaps even the entire Web - to match that Unicode character and replace it with a "-" dash.

Nope, can't do that with this extension. The only way to accomplish that still is to use a filtering HTTP proxy like privoxy or Proxomitron, and those are mighty broad brushes for just filtering page titles and nothing else.

Addendum: Fast forward eight months from my review, and its developer has listened and agreed and added regular expression parsing. Unfortunately... that parsing is applied to the URL to be matched and not the title, which is necessary to solve the scenario that I described. The title of any matched URL can only be replaced in its entirety, not altered partially by regular expression.