Palemoon is just like firefox, ihg installs on it easily from the imagehostgrabber.com site. pixxxels host isn't read though

you have to go to about:config in your address line and page down and find signatures required and toggle it to false

something about ihg isn't signed, so must be toggled on manually if it isn't showing up in the tools menu.

or go to settings and extensions to check to see if it is there, then you can follow the directions to activate it. i was having to do it about twice a week because FF would load and discredit the IHG add-on.

Pale moon is giving it credit though