A problem with the OverbiteWX add-on for Firefox:

Somehow the OverbiteWX add-on is making a mess of URLs shorter 
than a certain length.  At least that's what it looks like.  

This link works:
https://ifdb.org/viewgame%3fid%3drf9tvr2cjqxbwdav

IFDB entry

This does not:
https://ifdb.org/viewgame?id=rf9tvr2cjqxbwdav

IFDB entry

Instead, the URL presented to Firefox is this:
https://ifdb.org/viewgame%3fid%3drf9tvr2cjqxbwdav