Happily used Firefox for 2 years, suddenly it won't open - getting this error message: "Platform Version incompatible with minversion =1.9.1.11 maxversion =1.9.1.11" What can I do?

Before this happened, I was having a problem for about a month where Firefox wouldn't close. I'd close the browser window, and later when I tried to reopen it to connect to the Internet, I 'd get a msg saying that Firefox is already running, and I must close the current window before opening a new one. I'd have to restart my computer at this point.
I don't know if this is related to why I can no longer use Firefox at all.

The "Platform version incompatible" error message can be caused by a problem with the installation of Firefox. Remove your current installation of Firefox and re-install.
# Delete all the files and folders inside the Firefox installation directory - C:\Program Files\Mozilla Firefox\
# Download the latest installer from [http://www.mozilla.com/en-US/ Mozilla] and install it.
Doing the above will not remove your bookmarks, passwords etc, since they are stored in a separate folder.
If after re-installing you get the "already running" error, see [[Firefox is already running but is not responding]].

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