Rated 5 out of 5 stars
Long story short: Indispensable. I had to do a factory reset without getting a chance to secure my Firefox profile and not until rebuilding my profile in 3.5 did I ever realize how completely dependent I am on this add-on. I tried to get by but in the end I forced the install with Nightly Tester Tools. I only just did it and so far so good. However it turns out, it's too important to not try. Just thought I'd say so and perhaps in the process convey the need for an update and thereby hasten it. The vast majority of the behavior of my FF depends on it!This review is for a previous version of the add-on (0.3.7.3).