While the information is useful in itself, it is especially important for users who plan to move to Firefox 5. Adobe Acrobat Free Download For Windows 7 Full Version. ESR when Firefox 5. Couldnt load XPCOM error on Mozilla firefox while launching it How do i fix couldnt load xpcom error on firefox when opening firefox, follow these easy. When Firefox 57 gets released in November 2017, Firefox will drop its old addon system in favor of the relatively new WebExtensions system. NoScript for Firefox preemptively blocks malicious scripts and allows JavaScript, Java and other potentially dangerous content only from sites you trust. Download it. Flagship ZDNet weblog, covering a broad range of technology news. The essential tech news of the moment. Technologys news site of record. Not for dummies. November as the profile wont work then anymore if they have installed Firefox 5. In short If you want to switch to ESR, it may be a good time to do so before the Firefox 5. You may alternatively create a backup of the Firefox profile before you upgrade to Firefox 5. Firefox ESR on your system. Mozilla notes that the organization changed the on disk format of persistent storage in profiles in Firefox 5. Firefox after you used the profile on Firefox 5. Once a profile has been used with Firefox 5. Firefox. Indexed. DB, the DOM Cache API, Service Workers, and the asm. Firefox and some websites to break. The profile can be made operable again in older versions of Firefox by using the profile refresh mechanism. Summary. Article Name. You cannot downgrade Firefox 5. Description. If you have upgraded a version of Firefox to version 5. Author. Martin Brinkmann. Publisher. Ghacks Technology News.