The author of the awesome Tiny'R'SID has recently released (via his GitHub) an update which fixes playback issues on Firefox, as well as corrects another "bug" which caused some incorrect sound recreations. With this in mind, I have updated the .JS libs on my server, and updated the CODEF "support" for it! :-)
Thanks as always to Jurgen Wothke for his support, and love of the C64 scene!!
Enjoy - http://codef.namwollem.co.uk/newer_SID_player.html