Great extension, "Just works" for me :) Two small "fixes" needed Rated 5 out of 5 stars

Brilliant extension, I use it all the time and rely on it.Cannot recommend it enough.

I can't find a support page, this minor CSS item turned up in the Tab Mix Plus forum, copying it here for you.

Verticaltabs assumes how the user wants close buttons on tabs to behave. But Vertical Tabs doesn't offer a "close buttons" option, so it should leave this to other extensions to control, instead of forcing a specific behavior.

The lines:

.tabbrowser-tab:not(:hover):not([selected="true"]) .tab-close-button {
visibility: collapsed !important;
}

may need to be removed or modified, because it overrides and breaks the Tab Mix Plus option "show close button on all tabs".

Second "fix", if there are enough tabs that a scrollbar is displayed, you can use the keyboard, tab "search", URL bar etc, and be taken to a tab that isn't visible in the scrollbar (ie scrollbar "window" doesn't synchronise to the visible tab). Whatever tab you visit, the scrollbar should scroll if needed to make it visible.

@Alidan - I'm using Vertical Tabs with 300 - 500 tabs in a window and it's rock solid. You might want to look at Tab Groups Manager which is brilliant to organise 100's of tabs (if you aren't already using it), but I've never had Vertical Tabs fail on me yet.

This review is for a previous version of the add-on (0.9.3).  This user has a previous review of this add-on.