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how do I keep one instance of firefox instead of multiple instances of firefox?

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Instead of additional tabs opening I get multiple browsers..............help

Instead of additional tabs opening I get multiple browsers..............help

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Try to start Firefox in Safe Mode by holding down the Shift (Mac: Options) key to see if that helps.

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

  • Switch to the DEFAULT theme: 3-bar Menu button/Tools > Add-ons > Appearance
  • Do NOT click the Reset button on the Safe Mode start window

Boot the computer in Windows Safe mode with network support to see if that has effect in case security software is causing problems.