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I have a firefox desktop version 6.0.2 on my winXP but on add on site it says i have 3.5.3. I have tried to uninstall and install again. didn't work. What is the problem?

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when I got to the add-on site and try to download an add-on it says I have version 3,5,3 and it is not compatible. Tough I recently updated to 6.0.2. When I open the about window I can see I have 6.0.2 version.

when I got to the add-on site and try to download an add-on it says I have version 3,5,3 and it is not compatible. Tough I recently updated to 6.0.2. When I open the about window I can see I have 6.0.2 version.

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