Script Summary: On GOG, each game has a subforum, but this isn't linked on the game page. This script adds that link.
On GOG, each game has a subforum, but this isn't linked on the game page. This script adds that link to most pages. Since there is no ready way to find a specific subforum, this script doesn't work on every game page. It tries a few different ways to find the forum, so it should work on most games. If it for some reason cannot find the subforum, it links to the forum frontpage. In these cases, you can click the arrow in the Greasemonkey icon and open the 'User Script Commands' menu. The submenu that opens then contains the option to 'Set Custom Forum Location', so you can point it to the right page.
The script stores the subforums it finds, so while loading may take a little while when you first visit a game page, on subsequent visits it should be (nearly) instantaneous. This feature can be switched off, but it's not recommended.