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Weird red logo showing in some websites on Firefox

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Hi there! For the past 3 days, my browser has started to show in some websites a weird red window (kinda reminds me of the youtube logo with inverted colors!). I've already tried 4 antiviruses, 3 antimalware, and I've tried reinstalling the browser cleanly but the issue keeps happening. The other browsers (Chrome, Opera, Edge) are working just fine. The issue happens only on some websites and not at all of them. What should I do now? Thank you!

Hi there! For the past 3 days, my browser has started to show in some websites a weird red window (kinda reminds me of the youtube logo with inverted colors!). I've already tried 4 antiviruses, 3 antimalware, and I've tried reinstalling the browser cleanly but the issue keeps happening. The other browsers (Chrome, Opera, Edge) are working just fine. The issue happens only on some websites and not at all of them. What should I do now? Thank you!
Attached screenshots

All Replies (5)

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That is strange. Do you use any add-ons that control whether videos play?

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Maybe check the default colors.

  • Settings -> General: Fonts & Colors -> Colors
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jscher2000 disse

That is strange. Do you use any add-ons that control whether videos play?
I've tried with and without the add-on, but the issue doesn't seem to be related to this.

cor-el disse

Maybe check the default colors.
  • Settings -> General: Fonts & Colors -> Colors

There's no problem with the default colors.

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Maybe check this element in the Inspector.

You can right-click and select "Inspect" to open the built-in Inspector with this element selected.

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cor-el disse

Maybe check this element in the Inspector. You can right-click and select "Inspect" to open the built-in Inspector with this element selected.

I've tried this and compared the inspector in Firefox and Chrome using one of the websites with the bad issue I know of. Both looked the same to me, but I must confess I have zero knowledge about programming.