Firefox on Android and certificate error

Hello,

Has anyone else experienced trouble with the most recent versions of Firefox on Android lately? When trying to access anything through Ezproxy we now get a "This Connection is Untrusted" on the particular setup. When checking Technical Details I get "[...] uses an invalid security certificate. The certificate is not trusted because the issuer certificate is unkown. [...] Error code: SEC_ERROR_UNKNOWN_ISSUER".

To my knowledge, our certificate is ok. We have no problem with other browsers on Android, we have no problems on iPhone, with Firefox on Win7, Win10 and Linux Mint, and those are the ones I have tested.
Any suggestions?

Kind regards
Anders Johansson
Sweden


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