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When opening firefox 3.6.8 I get a java script error at line 323

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When trying to open Firefox 3.6.8, I get a java script error: [JavaScript Error: "dir is null" {file: "file:///C:/Users/My%20Computer/AppData/Roaming/Mozilla/Firefox/Profiles/lk5mbar9.default/extensions/%7B0538E3E3-7E9B-4d49-8831-A227C80A7AD3%7D/components/nsForecastfox.js" line: 323}]' when calling method: [ffIDiskService::get] If I cancel the error message, FF opens, but then my google search bar will not search & then FF freezes up. I'm using Windows7.

When trying to open Firefox 3.6.8, I get a java script error: [JavaScript Error: "dir is null" {file: "file:///C:/Users/My%20Computer/AppData/Roaming/Mozilla/Firefox/Profiles/lk5mbar9.default/extensions/%7B0538E3E3-7E9B-4d49-8831-A227C80A7AD3%7D/components/nsForecastfox.js" line: 323}]' when calling method: [ffIDiskService::get] If I cancel the error message, FF opens, but then my google search bar will not search & then FF freezes up. I'm using Windows7.

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That is a problem with the Forecastfox extension.

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).

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