Add exception for site in Icecat 91

[Alexander Asteroth]

Dear all,

I just installed icecat 91 from the git generating it from source. It
workt *really smoothly*! 

I'm just wondering if and how it is possible to add an exeption for a
site in case you trust that site and want to reveal JS content. The
manage exception dialog seems not to offer an add exception field.

Thanks for any help.

-- gyps