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When I launch FF I get "The application failed to initialize properly (0xc0000022). Click on OK to terminate the application" error. RE-named old FF folder, downloaded and ran newest version and still get same error

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I only get the above error message FF does even try to open. Tried un-installing and reloading the latest download from this site, then tried renaming the old FF folder and reloading, but still have the same problem.

I only get the above error message FF does even try to open. Tried un-installing and reloading the latest download from this site, then tried renaming the old FF folder and reloading, but still have the same problem.

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Hello.

Hopefully this support article is what you need:

https://support.mozilla.com/en-US/kb/Firefox+will+not+start

In any case, it's possible that you are having a problem with some Firefox add-on that is hindering your Firefox's normal behavior. Have you tried disabling all add-ons (just to check), to see if Firefox goes back to normal?

Whenever you have a problem with Firefox, whatever it is, you should make sure it's not caused by one (or more than one) of your installed add-ons, be it an extension, a theme or a plugin. To do that easily and cleanly, run Firefox in safe mode (don't forget to select Disable all add-ons when you start safe mode). If the problem disappears, you know it's from an add-on. Disable them all in normal mode, and enable them one at a time until you find the source of the problem. See this article for information about troubleshooting extensions and themes and this one for plugins.

If you need support for one of your add-ons, you'll have to contact its author.

If the problem is not disappears when all add-ons are disabled, please tell me, so we can work from there. Please have no fear of following my instructions to the line, as all can be easily undone.