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I see this on latest FF 20, and maybe 've seen it before. It's seen often, for about 20% of resize operations.

When i do resize of FF window border, i.e. make window smaller, or move/drag window to the right, i see strange freezes of FF UI.

  • FF can be closed during these freezes by Alt+F4, so not 100% freeze, it's semi-freeze
  • Menu items don't drop down during these.
  • Cursor is shown as "Resize arrow" during these.
  • Freeze lasts for 5-20 sec, after that menu becomes active

I posted comment to FF developers (via Help menu), no reply. Win7 x64 Basic

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1 Answer 1

Such issues often occur, because of damaged user profile. Use the Reset Firefox option in about:support to fix such issues.

enter image description here

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I can't accept,sorry. I have also WInXP with the same issue. Delete/reset profiles on 2 PCs? No, i have many settings, toolbar customized, add-ons... –  RProgram May 3 '13 at 15:12
    
make a backup of your current profile and test it. Now compare the pref files and copy the old settings back you need. –  magicandre1981 May 3 '13 at 19:22
    
how to? Have u instruction WHAT FILES to copy back, where profiles are located etc. Anyway- can FF fix a bug? –  RProgram May 3 '13 at 22:50
    
I use WinMerge to compare the old and new profile folder. The settings are stored in the prefs.js. –  magicandre1981 May 4 '13 at 6:56
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