Cant install BTTV on Firefox, help please

Hi Guys just lookinmg for some help please.
So i have just built a new PC and im tring to intstall BTTV on Firefox but i keep getting the connection error, i have tried disabling my AV as surgested and disabled any security in Firefox however i cant get it to install, does anyone know how to fix this?

Thank you

Hi, thanks for the reply upon deleting that folder i cant even load firefox.
Do i need to delete something within that folder?

Thanks

Firefox recreates that folder if it is missing. If it’s not, then your install of Firefox is corrupt and you should reinstall

Hi,

Complete reinstall of Firefox and Run Ccleaner before the new install, went straight to NightDev and this is what im getting

“The owner of nightdev.com has configured their web site improperly. To protect your information from being stolen, Firefox has not connected to this web site.”

??

Im going to reinstall my Antivirus as well

I fixed the issue by uninstalling my Antivirus, strange because i disabled it prior to trying to install BTTV.
I have never had this issue with Eset Nod32 before.

I will have to check the settings

Thanks