Firefox will not keep the extensions. I have to keep adding the ext's every time I re-open browser & it never did this before?

Hi 1st time asking a ?. Like my ? above. I have been using firefox for a long time and never had a problem that's why its my !st time asking a ?'s here. I'm using windows 8.1 Lenovo laptop and this has just started 4 days ago. I shut down firefox and the next day I started laptop and opened firefox and I noticed every extension I had set up were all gone from browser and the get extensions page were all gone in the get more extensions add on page area. So I re added all of them to set up the browser the way I liked for years and it worked OK. Then when I re-started the computer and they were all gone again? Its driving me crazy why this is happening. And I do have the latest firefox. I even uninstalled browser and re add them all Ext's and then on next start up were all gone again.
And the reason its my 1st time asking a ?'s is because to help others, I am a 56 year old & I'm a 100% disabled army Vet. and I don't know enough about fixing my own computer problems to help any 1 else asking to help them fix any thing.
OH theres 1 more thing, every time I have to re-install the Ext's and when I turn off laptop and turn back on then re add the Ext's again I noticed in Ccleaner in the firefox tab all of the Ext's that are gone from the browser are all there and I can not delete them either in Ccleaner! Please explain in easy to follow steps how to fix this so I can use firefox again? Thanks for any and all help?

It is possible that there is a problem with the file(s) that store the extensions registry.
Delete the extensions.* files (e.g. extensions.json, extensions.sqlite, extensions.ini) and compatibility.ini in the Firefox profile folder to reset the extensions registry.
*https://support.mozilla.org/kb/Profiles
New files will be created when required.
See "Corrupt extension files":
*http://kb.mozillazine.org/Unable_to_install_themes_or_extensions
*https://support.mozilla.org/kb/Unable+to+install+add-ons
If you see disabled or not compatible extensions in "Firefox/Tools > Add-ons > Extensions" then click the Tools button at the left end of the Search bar to check if there is a compatibility update available.
There is software like Advanced SystemCare with its Surfing Protection feature that can protect files in the Firefox profile folder against changes.
If you have such software then check the settings or uninstall this software.
Boot the computer in Windows Safe Mode with network support (press F8 on the boot screen) as a test.
*http://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/

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