This information is obsolete; I haven't worked on GIMP for a long time.

Web Browser GIMP extension is not an HTML browser (at least, not yet ;-); it's just an interface to an external web browser that allows GIMP, using a PDB call, to instruct a browser to open a URL.

Currently, it works with Netscape, version 1.1 or above, using a protocol described in detail on this page. If Netscape is not running already, the extension starts it, with a URL as a command-line argument.

For more information:
• read read the documentation,
• get the source for the extension (you might also get a patch for the Makefile),
• view a script-fu script that implements bookmarks (you will need to patch script-fu to run it),
• or, better yet, download everything (13K gzipped tar archive).

Screenshots: