Firefox 45 Will Remove Tab Groups Today, Get This Add-on To Replace It (softpedia.com)
An anonymous reader writes: Firefox 45, set to be released today, will remove the Tab Groups feature, a feature that many people used, but Mozilla decided to ask due to buggy code. The good news is that a developer created a perfect replacement for this feature as an add-on. Users that use Tab Groups on a daily basis are urged to install the add-on before upgrading to Firefox 45. The add-on will take over from the browser's Tab Groups feature without any complex configuration. Users that update to Firefox 45 will have their tab groups moved to their Bookmarks as folders, which may be difficult to move back into the Tab Groups add-on later on, especially if some people have hundreds of URLs.
Unlike IE, Chrome, and Safari, Firefox is not the default browser on any widely used platform (except desktop Linux, although even that is still mostly a system for nerds and not widely used by ordinary plebs). That means that the market for Firefox is the users that are knowledgeable enough to download a binary to replace the default web browser on their platform--likely, this means power users. Power users like things like advanced tab and cookie management. Power users do not like social media integration. Power users do not appreciate when the features they like (especially the ones they like enough to work around some long-lived bugs) are axed and replaced by an extension they have to go out and download.