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How to allow security exceptions for sites that don't allow exceptions

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[Locked as a duplicate of https://support.mozilla.org/en-US/questions/1223492. Please follow up there, thanks.]

I have a problem accessing some "simple sites" even though I don't want to log in. An example is a video on Twitter.com.

The problem appears to be that my corporate VPN or their custom security software is somehow interfering with the certificate. Asking them to change is not an option, as the timeline would be too late.

I don't care if the VPN or the website is "improperly maintained." It is necessary that I access these sites, and security and privacy is unimportant in this case.

I am not being given the option to Add an Exception, and I have tried all the options available.

Do I need to switch browsers in order to get what I need?

''[Locked as a duplicate of https://support.mozilla.org/en-US/questions/1223492. Please follow up there, thanks.]'' I have a problem accessing some "simple sites" even though I don't want to log in. An example is a video on Twitter.com. The problem appears to be that my corporate VPN or their custom security software is somehow interfering with the certificate. Asking them to change is not an option, as the timeline would be too late. I don't care if the VPN or the website is "improperly maintained." It is necessary that I access these sites, and security and privacy is unimportant in this case. I am not being given the option to Add an Exception, and I have tried all the options available. Do I need to switch browsers in order to get what I need?

Modified by Chris Ilias

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(Sorry for double post. After asking my original question, it disappeared from my "my questions" folder so I re-wrote it. But now I see the original question still exists)