Firefox 3.0RC1

I updated the Firefox to 3.0rc1 (release candidate) moments ago. There was four extensions I'm using that are not compatible with this version. Fortunately I've got them fixed by manually modifying the maxversions in install.rdf. The method is in below:

Step1: Find the addons file (*.xpi) and download it to your PC.
Step2: Unzip the xpi file.
Step3: Edit install.rdf and change the maxversion to 3.0.
Step4: Zip all files into *.zip and change it to *.xpi.
Step5: Install the new *.xpi by open file... in Firefox menu.

gmarks-0.9.9-fx
URL: https://mail.google.com/mail/?ui=2&ik=bcbfa2d058&attid=0.1&disp=emb&view=att&th=119f49a96c91b940

firegestures-1.1-fx
URL: https://mail.google.com/mail/?ui=2&ik=bcbfa2d058&attid=0.2&disp=emb&view=att&th=119f49a96c91b940

gladder-2.0.2.1-fx
URL: https://mail.google.com/mail/?ui=2&ik=bcbfa2d058&attid=0.3&disp=emb&view=att&th=119f49a96c91b940

simplemail.2.66
URL: https://mail.google.com/mail/?ui=2&ik=bcbfa2d058&attid=0.4&disp=emb&view=att&th=119f49a96c91b940