Firefox

Chrome and the Chromium engine won due to being so integrated with Google's services. All the stuff Microsoft got in trouble for in the 90's, Google was able to basically pull off with great fanfare. Though we are seeing MS be extremely aggressive tactics with "requiring" a Microsoft Account to make use of big/interesting features. But somehow they still seem the most "thirsty" out of the three of them lol. I think the main issue for Firefox is that it can feel a bit too technical for the average person. Some of the warnings or informational alerts might make people misunderstand what is being presented as their being a literal computer virus or other malware infecting the computer. When it is just FF trying to spread awareness of various things that impact privacy (sadly much like eulas it comes down to "well what are ya gonna do? Not use X?!?"). But I think I will do my part in encouraging customers to try it. When we setup new PCs, Chrome is just seen as a default to add. So I will start adding FF as another option or in place of Chrome (seeing how Edge will already work for basically all school or work sites that use Chromium features). lol