Error when trying to start Firefox with my old profile.
I recently got my computer up and running after not using it for a few months so I've seen that in that time Firefox has updated but I also noticed that my profile was gone and an "Old Firefox Data" folder was now on my desktop. I searched online on how to import my old profile and all and did the steps and everything seemed fine but once I closed out Firefox and tried to open it again I kept getting an error window.
It appears in a gray window and says this in it.
XML Parsing Error: undefined entity Location: chrome://browser/content/browser.xul Line Number 393, Column 7: <menuitem id="context_reloadSelectedTabs" label="&reloadTabs.label;" hidden="true" </p>
^
This has never happened to me before whenever I've had to import my old profile to a new version of Firefox or anything. I'm only able to currently use it by using the default profile.
Chosen solution
That error is referring to an internal part of Firefox's program files. I don't think anything you restored from backup could have corrupted those files, but I would still recommend replacing them as follows:
Clean Reinstall
This takes about 5 minutes. It's not about your settings, it's about making sure the program files are clean (no inconsistent or alien code files). As described below, this process does not disturb your existing settings. It's not essential to uninstall Firefox, but you can if you like, saying No to any request about removing personal data.
It only takes a few minutes.
(A) Download a fresh installer for Firefox to a convenient location:
https://www.mozilla.org/firefox/all/
(B) Exit out of Firefox (if applicable).
If you use Microsoft Office, please change your default browser to Internet Explorer temporarily before the next step.
(C) Using Windows Explorer/My Computer (hold down the Windows key and press E to launch it), right-click > rename the program folder as follows (you might have one or both):
C:\Program Files (x86)\Mozilla Firefox =to=> C:\Program Files (x86)\OldFirefox
C:\Program Files\Mozilla Firefox =to=> C:\Program Files\OldFirefox
(D) Run the installer you downloaded in step (A). It should automatically connect to your existing settings.
Any improvement?
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Chosen Solution
That error is referring to an internal part of Firefox's program files. I don't think anything you restored from backup could have corrupted those files, but I would still recommend replacing them as follows:
Clean Reinstall
This takes about 5 minutes. It's not about your settings, it's about making sure the program files are clean (no inconsistent or alien code files). As described below, this process does not disturb your existing settings. It's not essential to uninstall Firefox, but you can if you like, saying No to any request about removing personal data.
It only takes a few minutes.
(A) Download a fresh installer for Firefox to a convenient location:
https://www.mozilla.org/firefox/all/
(B) Exit out of Firefox (if applicable).
If you use Microsoft Office, please change your default browser to Internet Explorer temporarily before the next step.
(C) Using Windows Explorer/My Computer (hold down the Windows key and press E to launch it), right-click > rename the program folder as follows (you might have one or both):
C:\Program Files (x86)\Mozilla Firefox =to=> C:\Program Files (x86)\OldFirefox
C:\Program Files\Mozilla Firefox =to=> C:\Program Files\OldFirefox
(D) Run the installer you downloaded in step (A). It should automatically connect to your existing settings.
Any improvement?