Error: Javascript Application: what happened:[Exception... "Component returned failure code: 0x80520012 (NS_ERROR_FILE_NOT_FOUND) [nsIFile.createUnique]" nsresult: "0x80520012 (NS_ERROR_FILE_NOT_FOUND)" location: "
When I double click on the Firefox icon, a box pops up heading Javascript Application and inside is the error message as detailed above. The box offers only one option "OK" and once I click on that the program works well. I access emails online and when I click on the respons button or to send a new email, the same error message pops up.
Chosen solution
Start Firefox in Use Troubleshoot Mode in Firefox 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
Read this answer in context 👍 3All Replies (5)
Chosen Solution
Start Firefox in Use Troubleshoot Mode in Firefox 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
I solved my problem - it was an extension that was causing the problem, something called Ask Toolbar - after I disabled this, my Firefox is working 100%. Thanks for the advice!
You're welcome
The problem was caused by AVG's new security toolbar. Disabling it from add-ons has fixed the problem for me. Thanks for everyone's help. Hope this can help others. Larry.
Had no problems until I "updated" to Firefox 4.0. Now have this irritating problem on every computer "Updated". How can I go back to older version of Firwefox?
THIS SHOULD HAVE BEEN LISTED IN "PROBLEM" SECTION ---
Modified by 6407