Nowadays there are several webs from government, banks, etc... that need the usage of personal certificates to login into them.
There is no problem in Firefox desktop but in Firefox mobile there is no way to use personal certificates. So it cause the necessity to use an alternative browser for these kind of webs.
The strange thing is that in older Firefox mobile versions there were a way to use these certs but not in modern versions (?).
Try the following steps
Does this allow the websites to be accessed?
Unfortunately that setting seems that don't allow Personal certificates.
I've also tried the old "trick" that was manually adding the personal certs to Firefox cert files (as root) and it also doesn't work. At least it show the Personal certificates in about:certificate page but are unusable. That worked in previous (old) Firefox mobile versions but not now.
That is the only feature preventing me from deleting chrome
This is my usage case: firefox for general browsing and chrome for secured services that need personal certificate like banking, health services or taxes.
I want to get rid of chrome too but personal certificates support is a must.