Though it was made before inactive tabs grouping, so if this feature will get implemented (and I hope it will) they would probably use the same UI elements for custom groups as used for inactive tabs group.
Your idea has quickly received a great deal of votes (kudos) and support here in the Mozilla Connect community, so we are upgrading the status to “Trending idea.” This means it’s now one step closer to reaching our internal teams for review—learn more about The Idea Journey.
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As for you know there are folder for tabs on chrome (which is a great feature) You guys made a similar tool for Search grouping which has the similar potential but less accessible since we can't just move tabs there in or our (and worse we can't even rearrange them).
Chromes tab grouping is the best thing that happened to mobile browsers in a while. It helps so much keeping the 100+ tabs organized. Would be great to see that in Firefox mobile too.
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I am very excited for this. Its one of the things that has kept me from leaving chromium altogether! I hope this feature is similar enough that It does everything I need.