Clicking on a web link in documents viewed with Epdf nothing happens: it's because the default setting for the external browser call (see menu Edit-->Preferences) is "firefox %s". Newbies will find this frustrating, critics will snort at Puppy... Should be set to "defaultbrowser %s" or "mozilla %s"; or perhaps "PuppyBrowser %s" (capitals needed) for an even faster response.

add this to /root/.config/epdfview/main.conf

[command line] browser=defaultbrowser %s