Functionality wise I love this extension and wish I could keep using it but unfortunately performance wise I've determined it to be the culprit behind Firefox having a CPU usage upwards of 50% on an i5-9600K @ 5.0GHz with under a dozen tabs open. All of the tabs were extremely light pages such as wiki or github pages containing basically nothing but text and hyperlinks. I've never seen Firefox go above 10-15% CPU usage even with close to 100 tabs open across multiple windows on multiple monitors with stuff like YouTube and 3D web apps going, especially since hardware acceleration was added, but this extension bumped the Firefox task to 25-35% CPU usage as well as bumping Firefox's WebExtension task all the way to 15-25% for a total averaging 40-60% CPU usage. Immediately upon disabling the extension Firefox/WebExtension usage dropped down to normal levels. I ended up switching to the original Panorama View (which this extension is a fork of) and with all the same tabs open Firefox hasn't gone higher than 1% CPU usage and WebExtension hasn't gone above 0.2% so I'm not really sure what's going on with this extension but if you're using it I'd advise checking out whatever system monitor you use.

Too limited in usage compared to other tab add-ons such as simple tab groups and sidebery.

I like where this extension is going, but its not there yet. Its clunky, and you cant have the popup and the panorama view on 2 hotkeys, you have to switch between them in settings.

I want to love this plugin, but it's so buggy. All the features are exactly what I want, but it occasionally loses tabs when moving them between groups. Containers sometimes get hidden and are impossible to resize or bring to the front. Sometimes you click on tabs or containers and it doesn't respond to clicks. Dragging tabs between containers sometimes causes duplicate tabs. And more.

Great simple tool for organizing tabs but unfortunately it doesnt automatically back up your tabs (??? why) so I lost all of my tabs from an accidental misclick of closing my main window :/

Slight User Interface issues like unable to go to a group without selecting a tab from that group.

I was happy for a few months, but two days ago, I lost all my tabs, all of the sudden. I really don't know what happened. The groups are still there and buoyant, but empty.

First day of use and i lost my tabs

An excellent replacement for the old Tab Groups plugin. WOULD BE 5 stars but I just lost all my tabs AGAIN because I had opened another window with just one tab in it then closed my main window! The plugin only remembers tabs from the last window closed!!! Developer is normally VERY responsive for updates. Hope this gets fixed soon.