Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Firefox opens partially before opening to full screen.

  • 1 reply
  • 1 has this problem
  • 4 views
  • Last reply by cor-el

more options

When I open firefox it opens about a quarter size in my upper left hand corner and then finally goes full screen. In reddit they called it juddery but I can't find the article which had the solution.

When I open firefox it opens about a quarter size in my upper left hand corner and then finally goes full screen. In reddit they called it juddery but I can't find the article which had the solution.

Chosen solution

Try to rename/remove the xulstore.json file in the Firefox profile folder.

You can use this button to go to the current Firefox profile folder:


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 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
Read this answer in context 👍 0

All Replies (1)

more options

Chosen Solution

Try to rename/remove the xulstore.json file in the Firefox profile folder.

You can use this button to go to the current Firefox profile folder:


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 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