Dragonball Online's backstory was by Toriyama, so some people considered it canon, however he hasn't referenced anything from it in his more recent DB related work yet, throwing doubts regarding its validity. The most obvious example is that the remnants of Freeza's empire were supposed to have some surviving elite corps years into the future, but yet there doesn't seem to be anything like that group in RoF.
Toriyama doesn't really seem like he pays much attention to background setting that wasn't actually used by him in one of his works - the Tuffle/Saiyan backstory, and designs from the Z anime were by Toriyama even though they weren't in the manga. And yet, for the recent Episode of Bardock, Toriyama designed a completely different version of the Tuffles. He clearly kept some details, like them being a smaller race and living in planet Vegeta, but yet changed them from human-like to a completely different race visually.