Firefox (on Linux) usually but I also have Chromium (that's the one before it get#s "Googled" into Chrome) installed and have had a couple of occasions where a site does not work properly on Firefox. I think the last time that happened was about a month ago when Asda Mobile changed their mobile supplier from EE to Vodaphone. I needed (x3) to complete a form to get the new sim cards to keep the old accounts and phone numbers and I couldn't get that through with FF. I think I also have Opera installed but can't remember when I last used that.

I think I have Edge, IE, /Firefox and Chrome installed on the Win 10 part of my laptop but I rarely use any of them. I do have a rare need for IE there though. I don't understand the Hikvision/Annke logic but IE seems to be the only browser that will give a live view in the camera config pages. That's needed for example to mask an area or to set up the built in motion detection.