Recurring Issue: Firefox repeatedly identifies my Mac running OSX10.7.5 as a Windows PC. I have overridden once but cant find instructions again.

This has happened before and I was able to find instructions to override it, but can no longer find them.
Firefox is mis-identifiying my operating system as a version of Windows and as a byproduct, any download files are submitted as the Windows version rather than the Mac file type I need, including but not limited to my Firefox updates.
I work in a web development shop and have spoken to my local Mac store but none of the staff have ever heard of or come accross this issue before. It took months of frustration, searching and experimentation to find the solution the first time.
The instructions I found involved using a Firefox URL to access my computers Firefox profile and override the information within.
It would be great to have these instructions again for future use, but better would be to find a way to make this stop happening.
Thanks for your help.

This forum identifies you correctly as a Mac user:
*Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:25.0) Gecko/20100101 Firefox/25.0
Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
*Do NOT click the Reset button on the Safe Mode start window.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
See also:
*http://browserspy.dk/useragent.php

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