Caused me problems... Rated 2 out of 5 stars
I love the idea but had all manner of issues with this plugin.
I persisted until I investigated the cause of regular Firefox 12 crashes (Win 32) and found that disabling this plugin seemed to resolve the problem. I use a fair few plugins, so of course interaction between them may have been an issue.
I do appreciate the work the developer has put in to this and their kindness in making it available to the community, but I am now using Tree Style Tab and thus far am glad I switched.