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Firefox shrinks to smallest size possible when starting and shows error about a massing jar:file when expanded

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When expanded, the full error message is: "File not found

Firefox can’t find the file at jar:file:///C:/Program Files/Mozilla Firefox/browser/omni.ja!/chrome/browser/content/browser/browser.xul."

When expanded, the full error message is: "File not found Firefox can’t find the file at jar:file:///C:/Program Files/Mozilla Firefox/browser/omni.ja!/chrome/browser/content/browser/browser.xul."

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This sounds like something in the installation has become corrupt. You probably want to try re-installing Firefox and see if that helps.