After installing of the newest version v56.0 I can't run the browser from within the portableapps menu.
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After installing Firefox separately on my Desktop I have detect, that this Installation works fine.
After deinstallation via the Portableapps menu, I then looked into the folder "FirefoxPortable". Here I found the file "FirefoxPortable.exe" and the folder "App". However, I recognized that the icon to the left of the file name "FirefoxPortable.exe" was changed. My attempt to delete both this file and the folder failed. Instead, I received the following error message:
You must obtain the necessary permissions from the "administrator of the computer" to make changes to this file.
That's a permissions issue with the underlying file structure. Neither the platform, the installer, nor the app changes these, so something else did. You'll need to ensure your current account has the appropriate permissions for the entire file structure you're running apps from.
Sometimes, the impossible can become possible, if you're awesome!
I think also about this fact, that my account has not the appropriate permissions. After I have done a few minutes ago, however, a Windows update, which was offered to me automatically, now works again the browser Firefox. Some miracles seem to have taken place
I'm guessing that the Windows update you installed required you to restart the PC as it is very unlikely that the update itself fixed the issue. It's far more likely that some program (potentially even Windows itself) had locked the file and the lock was removed when the computer rebooted.
~3D1T0R