Nice tool! - Instead of uploading a custom icon, optional, what do think about the possibility of setting an alternative url as a favicon-resource ("redirecting")? I'm thinking of an often occuring problem of having a bookmark to a login-site subpage without a favicon, though the main url of the page have one. Also in this way the favicon would always be up to date. - Beside that, creating a backup-file per click with all url patterns and icons would be great (i.e. if you have to reinstall system or something like that). THANKS!

Works fine here, however I need to be on the active tab for the icon to apply. If I have multiple tabs open and one of them refreshes in the background, it will lose the icon. 5 out of 5 if this would be fixed!

It worked perfectly on the first try. It took me a second to find how to configure the add-on, but once I did, I was able to set a favicon for a website that had no favicon. Woohoo!

It would be convenient if you could right-click on a tab and there would be an option "Set Favicon" that would autofill the favicon-customizer configuration with the website URL and allow me to set a favicon.

The extension fails when you open a link in a new TAB, doing it with a ctrl+click or with the mouse's context menu "open in new tab". Then, you have to refresh the page with ctrl+F5 to show the icon.

doesnt always work directly (sometimes must refresh) but then it's a really good help

Works OK-ish. It seems to show my custom icon only when I refresh the page. On new page, or after fresh Firefox start, it shows the original favicon again (on pinned bookmark for example). Would be awesome if my custom icon always had priority over the original one.

Also, it would be great if I could enter the URL with regular expressions like *.website.com/* to the URL bar in the options.

Schade dass es noch so umständlich ist, aber wenigstens funktioniert es. Wenn jemand ein besseres Plugin hat, gerne her damit ;-)

This addon does work and it's wonderful

It works for me, it would be nice if you could right-click into a bookmark and change the icon from there, though.

Every time, need to be on the tab to see the new favicon. It is an overhead.
If it does this automatically, it would be nice:)

新しいFirefoxで利用出来なくなった「Bookmark Favicon Changer」の代わりに使えました。
ただファビコンのエクスポート機能はないので特定のサイトのファビコンを利用したい場合は
現在も利用可能なChrome版「Bookmark Favicon Changer」のエクスポート機能を利用しました。

ファビコンの拡張子は「.ico」は利用できないようで「.png」なら使えます。

セーブしてもファビコンが変わらない場合は以下を再確認してみてください。

・「page title string」にはタブに表示されている正確なサイトタイトルを記入する。

・セッティング前にブックマークしていた場合は古いブックマークを一旦削除してリロードして
　再度ブックマークに追加してもう一度リロードしてみる等…

設定記入欄はFirefoxの仕様でクリック禁止になっていてクリックによるコピペが使えませんが
ショートカットキーによるコピペは使用可能です。
URL等を記入する際はショートカットキーでコピペすると楽です。

I got this to work once I made sure the URLs were exact. It won't work on subdomains unless I set up an entry for each subdomain. It would be helpful have a favicon for a site and all it's subdirectories (eg http://*.example.com) and then override those where the specific URL is given. I'd also like to set up a favicon using the URL and a string that's in the path or parameter (which may also work for subdomains) so that when i have different sites open in web.archive.org I can differentiate them. The page title string isn't effective for any of the sites I need because they all use the main site name as the page title if they have one, so it would be helpful differentiate them by a common string in part of the URL.
Overall this is a huge help in trying to quickly find the tab I want when i have a lot open.

Great for use when you pin tabs without and favicon to identify. Webmail, chats etc.

Seems simple enough to use. Local site had no icon which was annoying since I have the page pinned so it was just blank essentially. Used their own logo from the page as new favicon and dropped in the URL. Then a quick refresh of the page and presto! New favicon set. THANKS!!

It simply doesn't work, at least not on bookmarks toolbar.
Update: you have to actually open that bookmark for it to update, so it actually works. Just not the way i expected it to.