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"undefined" dialog box appears

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when i right click on something, mainly to copy and paste an annoying dialog box stating "undefined" appears. I click ok to dismiss the warning or whatever that is, then I right click or ctr c again, the same box pops up again this time thankfully with an option that says "do not show this again" or something to that effect. How can I get rid of that?

I managed to recreate it, however now its displaying something in Russian, I can only assume its the same message. It should be english.

when i right click on something, mainly to copy and paste an annoying dialog box stating "undefined" appears. I click ok to dismiss the warning or whatever that is, then I right click or ctr c again, the same box pops up again this time thankfully with an option that says "do not show this again" or something to that effect. How can I get rid of that? I managed to recreate it, however now its displaying something in Russian, I can only assume its the same message. It should be english.

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This issue can be caused by an extension that isn't working properly.

Start Firefox in Safe Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration is is causing the problem.

  • switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Appearance
  • do NOT click the "Refresh Firefox" button on the Safe Mode start window