page loads to small ICON above tol bar but won't open to full sixe page
Page opens to small window above toolbar but won't expand to full size page
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Can you open its system menu via Alt+Space and resize the window via that menu ?
You can try to go to full screen via F12 to have at least a browser window. You can try to rename/remove xulstore.json in the Firefox profile folder with Firefox closed.
You can use the button on the "Help -> More Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page (Root directory).
- Help -> More Troubleshooting Information -> Profile Folder/Directory:
Windows: Open Folder; Linux: Open Directory; Mac: Show in Finder - https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data
- C:\Users\<user>\AppData\Roaming\Mozilla\Firefox\Profiles\<profile>