- Add-on Compatibility Center - See whether the popular extensions that make up 95% of add-on downloads are compatible with Firefox 3.5 before you download. It's looking pretty green and good at the moment, with the notable exception of Tab Mix Plus.
- Top 10 Firefox 3.5 Features - Breaking down the Private Browsing Mode, TraceMonkey JavaScript engine, little interface features, and bigger changes to the increasingly popular open-source web browser.
- Disable location-aware browsing and tab tearing - If those features sound more like privacy invasion and mouse-clenching hassle, respectively, they're pretty easy to turn off.
- Make your extensions work with (Firefox 3.5) - Originally written for the big (bigger?) Firefox 3.0 upgrade, but this little about:config tweak should keep those extensions not yet upgraded working with 3.5 as well, assuming you don't mind potential bugs.
- Weave synchronization tool - Mozilla's experimental synchronization project only works with Firefox 3.5—but, wait, that's out now! It's worth checking out, especially if you're running Firefox across multiple systems.
- Firefox 3.5 Overview - It's both a video run-through of Firefox 3.5's features, and a test of the new no-Flash-needed video powers of Firefox 3.5 (non-HTML5-compliant browsers will just get an .ogv video download link).
Firefox 3.5 - It's Time for an Upgrade [Mozilla]