Check Tor Browser 8 memory usage

Originally created by @intrigeri on #15716 (Redmine)

My test VM with 2GB of RAM quickly becomes sluggish when I use Tor Browser 8 and do a little bit of other things on the side, like installing bpython and running journalctl -f.

Parent Task: #15023 (closed)

Related issues

Blocks tails/accounting#15334

Edited May 15, 2020 by intrigeri

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