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Why is firefox add ons saying that I need to upgrade to 3.6 or 4.0 when I have 4.0 and I have checked it and verified that it was properly downloaded and installed?

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Why is that after I have upgraded twice to 4.0 is it saying that certain add ons are only available on 3.6 or 4.0, and I am using 3.5 and I am not then when I search for versions made for 3.5 and try to add them it says they arent compatible with 4.0 which means I do have 4.0 and I am not liking it much anyway so this is really angering me.

Why is that after I have upgraded twice to 4.0 is it saying that certain add ons are only available on 3.6 or 4.0, and I am using 3.5 and I am not then when I search for versions made for 3.5 and try to add them it says they arent compatible with 4.0 which means I do have 4.0 and I am not liking it much anyway so this is really angering me.

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