In Chrome, the first time you hit ctrl+v, you get a permission prompt asking for paste permission. If you grant permission, translate.google.com gets permanent permission to read the clipboard. In Firefox, we prompt to allow the individual paste using the context menu that you described in comment #4 . If you click away to dismiss the paste menu, the paste is not allowed and we can reproduce the error message described in comment 0. If there is a machine where you are very very sure that the paste menu does not even show up, that would be interesting to know... but off-hand, this seems like a UX problem where it's not obvious how to make the paste succeed (and a bit tedious, if you trust the site, to allow each individual paste every time). Moving to the component where the implementation of the website paste stuff lives.
Bug 1937336 Comment 5 Edit History
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In Chrome, the first time you hit ctrl+v, you get a permission prompt asking for paste permission. If you grant permission, translate.google.com gets permanent permission to read the clipboard (so you don't get asked for subsequent pastes). In Firefox, we prompt to allow the individual paste using the context menu that you described in comment #4 . If you click away to dismiss the paste menu, the paste is not allowed and we can reproduce the error message described in comment 0. If there is a machine where you are very very sure that the paste menu does not even show up, that would be interesting to know... but off-hand, this seems like a UX problem where it's not obvious how to make the paste succeed (and a bit tedious, if you trust the site, to allow each individual paste every time). Moving to the component where the implementation of the website paste stuff lives.