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I can't copy and paste on Firefox

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This happened once before and I think it was right after an update. One day it worked, the next it didn't. I found out how to fix it but it's been so long I can't remember. I seem to remember having to change something in "settings" or something to that effect.

This happened once before and I think it was right after an update. One day it worked, the next it didn't. I found out how to fix it but it's been so long I can't remember. I seem to remember having to change something in "settings" or something to that effect.

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I posted a response in your other thread over here: https://support.mozilla.com/en-US/questions/815745