Recent Commits to firefox-csshacks:master

standalone images: Don't set auto margin by default

It break zoomed-in images.

multi-row-tabs: Use tabbrowser-tabs as the tab container

This makes tabs scrollboxes have display:contents and thus makes tabs
use tabbrowser-tabs as their parent container.

Reason being that in firefox 141 the pinned tabs are moved to separate
scrollbox which would then have it's own display block.
Fixes #551