Tab_Mix_Plus
Tab Mix Plus (often abbreviated TMP) was a Mozilla Firefox extension that adds to the tabbed browsing functions in Firefox. It was a popular extension on Mozilla Add-ons, which records download statistics. TMP is a collection of features from other extensions built in one package.[3][unreliable source?] Lifehacker named it one of their "Top 10 must-have Firefox extensions" for 2009.[4] PC World said that "With Tab Mix Plus, Firefox tabs go past the obvious and into the indispensable... it's hard to imagine how you lived without it."[5] As the only extension providing multi-row tab support, Wired and CNET both called it a "must-have" that is "powerful"[6] and "gives you what feels like an infinite amount of control over tab behaviour."[7]
The original Tab Mix Plus ceased to be compatible with Firefox upon the release of Firefox 57 Quantum, due to the switch to the WebExtensions interface. A complete rewrite of the extension under development build has been released, called Tab Mix WebExtension, with limited features[8] and not yet compatible with Quantum.