Why has FF suddenly stopped recognizing that I have Microsoft Excel installed. It cannot find it when I export from a website.
I updated to Win 10. When I'm exporting from a website to Excel 2010, Firefox wants me to browse for the app, but it's not finding it. It's there, I have it pinned to my taskbar and use it daily. I have gone into Applications and told it to "Use Microsoft Excel (default)" to open this type of file. But, it's still not working. This is happening to a few co-workers as well.
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Remove Firefox's plugin registry file Sometimes the pluginreg.dat file becomes corrupted. You can remove it and have Firefox re-scan for plugins. As a side effect, any plugins you have disabled on the Add-ons page probably will be re-enabled, so you'll need to go back to that page one more time.
Forgot to add;
Type about:support in the address bar and press enter.
Under the page logo on the left side, you will see Application Basics. Under this find Profile Folder. To its right press the button Show Folder. This will open your file browser to the current Firefox profile. Now Close Firefox.
Locate the above file. Then rename or delete it. Restart Firefox.