The error »Could not load XPCOM» is generally due to Windows updates. Even though there are several methods on the Internet to fix the problem, the one in this guide is, with much, the easiest i have found.
To continue with this method, you must use Internet Explorer (which is there by default, or another browser if you have it installed)
If you can't locate / halls Internet Explorer, just hold down the Windows key on your keyboard and press R to open the run dialog, y en el diálogo de ejecución escriba -> iexplore.exe y haga clic en Aceptar.
Method 1: repair corrupt files
Download and run Reimage Plus to scan and restore corrupted and lost files from here, and then check if you keep getting the error. If so, continue with method 2.
Method 2: just update / reinstall
This method has worked for most users and is very easy to follow. Once you are in Internet Explorer or another browser, just go to the next address to download the latest installation file for Firefox, run it and install it. https://www.mozilla.org/en-US/firefox/new/?product=firefox-3.6.8&os = osx% E2% 8C% A9 = en-US
Method 3: Backup and clean install
Before starting, if you want to make a backup of Firefox and you can also choose to export certain things like your history, passwords or bookmarks and you can import these bookmarks later from Chrome or other browsers.
1. Download the trial version of 30 RevoUninstaller days by visiting www.revouninstaller.com and clicking the following site button
Download the Revo uninstaller
2. You should now have the Revo installation file, open it and install it. Once installed, you will have the RevoUninstaller icon on your desktop. 3. Open Revo Uninstaller and select Firefox,
3. Now click on Uninstall and then select Advanced and follow the instructions on the screen to uninstall Firefox.
4. 4. Then select Advanced and click Scan in Revo Uninstaller.
5. The next screen will present you with the leftover files, see screen below, select them all and click Delete.
6. Then, go to C first: N- Program files, delete the Mozilla Firefox folder and also check C: N- Program files (x86) N.
7. Once this is done, just reinstall firefox and that should fix the problem.
