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For anyone who can't wait any longer... Rated 5 out of 5 stars
1) Install the Nightly Tester Tool add-on
2) Go to "Tools" > "Add-Ons"
3) Right-click on the desired, incompatible add-on
4) Click "Override compatibility"
5) Add-on will install
6) Be aware that it might be instable or crashes FF.
Firefox 3.5 update has been uploaded
I have uploaded a new version of Classic Compact Options that is compatible with Firefox 3.5. It is should be made public very shortly once it has been reviewed by an AMO reviewer.