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firefox lost my tabs

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FF4.0.1 on Win 7, i7, 3gb RAM, FF 4 is much faster than 3. I had a LOT of tabs (around 150), and a couple more in different panoramas. FF4 started getting quite slow. I shut down normally. I restarted, and all my tabs and panoramas are gone!

I've looked in my Profiles folder, there's only one profile. sessionstore.js is quite big, around 1006Kb, and in a text editor looks like it's got everything. But FF doesn't seem to be picking them up. Any ideas? Thanks

Additional System Details

Installed Plug-ins

  • np-mswmp
  • The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
  • Adobe PDF Plug-In For Firefox and Netscape "9.4.4"
  • Shockwave Flash 10.3 r181
  • iTunes Detector Plug-in
  • 4.0.60310.0
  • Office Authorization plug-in for NPAPI browsers
  • The plug-in allows you to open and edit files using Microsoft Office applications

Application

  • User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0.1) Gecko/20100101 Firefox/4.0.1

More Information

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Firefox
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about:buildconfig
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Graphics
Adapter Description
NVIDIA GeForce 9800 GT
Vendor ID
10de
Device ID
0614
Adapter RAM
1024
Adapter Drivers
nvd3dumx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um
Driver Version
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Driver Date
4-3-2010
Direct2D Enabled
Blocked on your graphics driver. Try updating your graphics driver to version 257.21 or newer.
DirectWrite Enabled
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WebGL Renderer
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GPU Accelerated Windows
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traidautay16499 0 solutions 1 answers

I think you wasn't choose "show tabs from last time" in the options,so your tabs when you shutdown will be lost.

Question owner

Thanks for your response. No, that's not it. From Options> General> "Show my windows and tabs from last time" is selected. The fact that the sessionstore is so large and does contain the list tells me that it is storing the tabs, it's just not reloading them. Why not? How can I get it to?