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url error for good a web address occurs often

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The URL is not valid and cannot be loaded.

message occurs almost everytime I click on a web site link on my bookmarks, or within a website like farmville on facebook.
The URL is not valid and cannot be loaded. message occurs almost everytime I click on a web site link on my bookmarks, or within a website like farmville on facebook.

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Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).

  • Don't make any changes on the Safe mode start window.

See Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems and Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems

If it does work in Safe-mode then disable all your extensions and then try to find which is causing it by enabling one at a time until the problem reappears.

>In Firefox 4 Safe mode also disables plugins (Tools > Add-ons > Plugins) and hardware acceleration (Tools > Options > Advanced > General)