Shared components used by Firefox and other Mozilla software, including handling of Web content; Gecko, HTML, CSS, layout, DOM, scripts, images, networking, etc. Issues with web page layout probably go here, while Firefox user interface issues belong in the Firefox product. (More info)
Created attachment 538737[details][diff][review]
I didn't want to jump in to this too quickly, but I think at this point, it's safe to say that nobody will be simultaneously pushing from an hg trunk tree to CVS trunk and MOZILLA_1_8_BRANCH.