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On account of some Extension and add-on's how can I go back to an older version of FF.

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I like to get back to an older version of FF, since the current 3.6.13 does not allow some extensions and add-on's.

Please provide a link to download older FF versions.

Better yet, can't FF upgrades retain compatibility of extensions and add-on's??

I like to get back to an older version of FF, since the current 3.6.13 does not allow some extensions and add-on's. Please provide a link to download older FF versions. Better yet, can't FF upgrades retain compatibility of extensions and add-on's??

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See Install an older version of Firefox.

For info, it is up to the authors of the extensions to update them to work with newer versions of Firefox.

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Which extensions do not work with Firefox 3.6.13?

Delete the files extensions.* (extensions.rdf, extensions.cache, extensions.ini, extensions.sqlite) and compatibility.ini in the Firefox profile folder to reset the extensions registry. New files will be created when required.
See "Corrupt extension files": http://kb.mozillazine.org/Unable_to_install_themes_or_extensions

If you see disabled, not compatible, extensions in "Tools > Add-ons > Extensions" then click the "Find Updates" button (in Firefox 4: right-click the extension -> "Find Updates") to do a compatibility check.


There are other things that need attention:

Your above posted system details show outdated plugin(s) with known security and stability risks that you should update.

  1. Shockwave Flash 10.0 r45
  2. Next Generation Java Plug-in 1.6.0_16 for Mozilla browsers

Update the Flash plugin to the latest version.

Update the Java plugin to the latest version.