It's not just the classic "evil" companies though. When you buy a jar of peanut butter, do you demand every cent to be going to production of the jar without overhead? Do you check the peanut butter company's CEO's salary to ensure it's not too high? I sure don't.
But we have a lot of control over the software we use on a daily basis, and there are several capable browsers. I want to use a browser that has a commitment to privacy, is still functional, etc. and Firefox fits the bill for many. If it doesn't, they want to know so they can change it. Food is a little more complicated in that regard. For instance, if you find the "better" brand tastes terrible...well, it's not really a choice.
Like I anwered to a sibling comment of yours, I'm not making a point about whether Firefox fits the bill; I'm trying to say that focusing on exec pay, rather than on whether it does fit the bill, is probably focusing on the wrong things.
For this to be an accurate comparison, there should be two free sources of peanut butter, one that I want to donate to because it helps keep the peanut butter playing field level, while the other has a massive majority of the peanut butter market and uses that to do various anticompetitive things. But the one I want to support doesn't accept donations, only the parent conglomerate does.
I feel like you might be missing the point I'm (and GGP's) trying to make. If you're considering whether to give your money, why would you focus on exec salaries rather than results? So the comparison is: if you're buying a jar of peanut butter, why would you focus on what their execs are paid, rather than the peanut butter it will get you?
(And to pre-empt that: I'm not saying you can't criticise results. I'm saying that focusing on exec pay rather than on results feels misdirected.)
If they said you could donate on top of the jar price to help the poor third world peanut farmers, and you did so, and then found that money went to the CEO's salary and a rebranded PeanutVPN product, and then the Peanut Butter CEO justified it by saing that Mark Zuckerberg and Satya Nadella get paid a lot so it's not fair if they don't, would none of that that annoy you?