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I can no longer log into my online banking website and have tried all of the suggested Firefox fixes apart from resetting Firefox, any other suggestions?

Time:October 11
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When I try to enter my customer number to log into my online banking website, an error message reads:
This form has been re-submitted. Re-enter your customer number and submit only once.
When I called the bank to find out if they could help they said it was a browser issue and suggested I should use IE or Chrome (No thanks!).
I have gone through all of the Firefox suggested troubleshooting fixes including deleting the cookie files. I have not yet tried resetting Firefox as I was hoping for a simpler solution before taking this step.
Thanks for any help you may be able to offer.
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If it works in Safe Mode and in normal mode with all extensions (Firefox/Tools > Add-ons > Extensions) disabled then try to find which extension is causing it by enabling one extension at a time until the problem reappears.
Close and restart Firefox after each change via "Firefox > Exit" (Windows: Firefox/File > Exit; Mac: Firefox > Quit Firefox; Linux: Firefox/File > Quit)
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes