Got it - thanks!
When I tried it I replaced ‘toolbars’ with ‘portable%20settings’ because I thought spaces would be a problem, but Firefox put a space in the address string anyway. So it works either way.
Not that it matters here, but replacing the 2nd ‘http’ with ‘https’ also works. The cached copy from Google uses https either way.
In lieu of a search box, which would be equally valuable in a local copy of the manual, I will write a .bat file to search the local copy. I’ll share it here. I will use FINDSTR just because it comes with windows, but GREP users will have no trouble changing the switches.
Topic about .bat file split to http://forum.audacityteam.org/viewtopic.php?f=46&t=92596