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it wont let me add new add-ons llike stumbleupon or firefox sync it give me an error what is wrong?

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tomkat9
tomkat9
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every time i try to add a new add-on i get an error saying firefox could not install the file at url. because: unexpected installation error review the error console log for more details. -203. it does this with any add on i try to add.

every time i try to add a new add-on i get an error saying firefox could not install the file at url. because: unexpected installation error review the error console log for more details. -203. it does this with any add on i try to add.

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TonyE
TonyE
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See Unexpected installation error -203 when installing add-ons