Is waterfox spooky?

I have been using Waterfox for some time now, and I generally really like it, and since it appears to be using QT I do not have that annoying mismatch I tend to have with Firefox and Librewolf. However I did recently become aware that it's owned by an ad company, my general question is have they done anything spooky yet? also while this might come off as a general paranoia are the accounts I logged in using Waterfox safe