I personally use a fairly vanilla Firefox with a few addons and try to keep customization as default as possible. How will further differentiating yourself from the masses (especially since Firefox is already a minority browser) help with privacy, tracking, and fingerprinting? Why not at that point just change your user agent to Chrome/Win7 and run everything in a virtual machine?
edit: To that end, does anyone use browser forks (like Waterfox and Palemoon, or things like unGoogled Chromium) and seriously think they're better than the mainline browser? I see a lot of fair criticism for what Mozilla has done with Firefox (deprecating old extensions, Mr. Robot addons, Cliqz, etc) but it's pretty much the most trustworthy Internet company as far as I'm aware. They seem to genuinely have good will and Open Source at their core, and these forks claiming that Mozilla is this monstrous organization looking to invade your privacy (along the lines of what Google does) seem a little silly to me.