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You may have a corrupt cookies.sqlite file.

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 it’s right press the button Show Folder. This will open your file browser to the current Firefox profile. Now Close Firefox.

Locate the cookies.sqlite file. Then rename or delete it. Restart Firefox.

You may already have tried this, but, have you deleted all Google cookies from your Firefox? You can use the Permissions Manager page to check all Google sites fairly quickly. Type or paste about:permissions in the address bar and press Enter to load the page.

The left column should start to fill with a list of sites from your history. In the search box above the list, type google and Firefox should filter the list for you to a handful of sites. Click the first one and then on the right side, you can remove its cookies. Work your way through all of them to ensure they are all gone.

Does Google work any better after that?