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250k is probably below the average pay for an Apple engineer, not to mention other costs and benefits. ICT3 numbers (just above entry level SDE) are 230k and ICT4 are 340k. 500k isn’t that difficult at the more competitive software companies located in tier 1 and 2 markets. But yes, CEOs and E levels make far too much for their impact.
I’m away from my PC so I can’t name it but there’s another plugin similar to Tree Style Tabs. The creator claims that TST takes up a lot of resources. I do notice Firefox taking a lot of CPU/mem but that’s probably my fault. I’ve tried both and either works well.