3 Solutions to Invalid File Hash Error in Firefox

Fri, Jul 10, 2009

Tech Tips

If you received the following error when trying to update a Firefox extension:

Firefox could not install the file at
because: Invalid file hash (possible download corruption)

Here are three possible fixes:

1) Clear your Browser History, Browser Cache and Cookies
You can do this from the menu by clicking Tools -> Clear Private Data. Select Browsing History, Cache and Cookies. Then “Clear Private Data Now”.

Clear private data in Firefox to fix error message.

Clear private data in Firefox to fix error message.

2) Manually Upgrade/Install the Extension
This is done by right clicking on a download link for the extension, and clicking Save As. Save the file to your desktop. then drag the file to a Firefox window.

3) Disable and Enable the Extension
From the Add-ons window, highlight the extension and click the Disable button. Restart Firefox, re-enable and Restart Firefox again.

Option 1 worked for me. Option 2 should always work. Option 3 is kind of a stretch (but worked in some user cases).

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