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Add-on compatibility with Firefox 4?

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Add-ons that are necessary for my work can't be used with Firefox 4. I had no choice but to go back to Firefox 3.6. I love version 4, and it was hard to go back, but I need those add-ons.

May I have both version 3.6 (for my work) and version 4 on the same computer at the same time? When I downloaded 3.6, version 4 was automatically removed.

Add-ons that are necessary for my work can't be used with Firefox 4. I had no choice but to go back to Firefox 3.6. I love version 4, and it was hard to go back, but I need those add-ons. May I have both version 3.6 (for my work) and version 4 on the same computer at the same time? When I downloaded 3.6, version 4 was automatically removed.

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i love channel hoppin on fox tv and not compatable with the new socalled better ff4 please sort it out thanks