1. Rhythmbox does not really do anything with a local .pls file.
2. Opening the the .pls file in Totem opens and plays the file.
Possible solutions:
A. Add local .pls file support in Rhythmbox (requires a patch that adds functionality)
B. Associate the .pls file with Totem by default. (simple and logical, a good work around until Rhythmbox works as intended)
C. Make firefox pass the URLs to the mozilla-totem plugin.
1. Rhythmbox does not really do anything with a local .pls file.
2. Opening the the .pls file in Totem opens and plays the file.
Possible solutions:
A. Add local .pls file support in Rhythmbox (requires a patch that adds functionality)
B. Associate the .pls file with Totem by default. (simple and logical, a good work around until Rhythmbox works as intended)
C. Make firefox pass the URLs to the mozilla-totem plugin.
Go with option B.