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firefox hello "sign in or sign up" generates a blank tab

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firefox hello "sign in or sign up" generates a blank tab, blank apart from a link to Mozilla in the top right corner. Also instead of a Firefox Hello button I have a string of symbols. Firefox hello does work as I have made a test call.

firefox hello "sign in or sign up" generates a blank tab, blank apart from a link to Mozilla in the top right corner. Also instead of a Firefox Hello button I have a string of symbols. Firefox hello does work as I have made a test call.
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Chosen solution

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

  • Switch to the DEFAULT theme: Firefox menu button/Tools > Add-ons > Appearance
  • Do NOT click the Reset button on the Safe Mode start window
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Seçilmiş Həll

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

  • Switch to the DEFAULT theme: Firefox menu button/Tools > Add-ons > Appearance
  • Do NOT click the Reset button on the Safe Mode start window
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My theme "Simple White", was no longer compatible with the current Firefox. I now have "Simple White X". The Firefox Hello icon is an empty thought balloon.

Thanks.