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I can't use Firefox when using company proxy server

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I love Firefox; it's fast and user friendly. Unfortunately it doesn't work well with my company's proxy server. My company has 160,000+ staff and I am unlikely to be able to get the IT department to change it's policies. They only officially support IE (really!). We are allowed to use Firefox, but our IT department don't support it, actively discourage it's use, and do not test the company security proxy server with Firefox. In the fine print of one internal support document they give a link to a certificate that allows Firefox to work, but this certificate has to be re-installed when Firefox is updated. I am concerned that pretty soon I won't be able to use Firefox at all if Firefox doesn't work out how to work better with proxy servers. Firefox needs to be able to load any website that IE can load (unless it uses flash and other malware).

I love Firefox; it's fast and user friendly. Unfortunately it doesn't work well with my company's proxy server. My company has 160,000+ staff and I am unlikely to be able to get the IT department to change it's policies. They only officially support IE (really!). We are allowed to use Firefox, but our IT department don't support it, actively discourage it's use, and do not test the company security proxy server with Firefox. In the fine print of one internal support document they give a link to a certificate that allows Firefox to work, but this certificate has to be re-installed when Firefox is updated. I am concerned that pretty soon I won't be able to use Firefox at all if Firefox doesn't work out how to work better with proxy servers. Firefox needs to be able to load any website that IE can load (unless it uses flash and other malware).

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Hi BigBlueWombat, it's great that your IT provides the certificate to import You shouldn't need to do that often, unless your cert9.db (Firefox's certificate store file) is getting erased during updates or removed by a Firefox Refresh.

There is another workaround: set Firefox to trust the certificates in the Windows certificate store. Here's how:

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button promising to be careful or accepting the risk.

(2) In the search box above the list, type or paste roots and pause while the list is filtered

(3) Double-click the security.enterprise_roots.enabled preference to switch the value from false to true

Importing is a bit more protective because malware is far less likely to infect Firefox's certificate store than the system certificate store shared by Microsoft and Google browsers. This may not be a concern on a company PC.