I have a Linux HTPC (or TV Box) that I cannot suspend (hardware issues as often on these mini-PCs).
I thus made a small utility to freeze the browser when idle, to prevent heat generation, as it is using CPU significantly:
(or if you dont want to suspend, for cronjobs)
github.com/ColasNahaboo...
A small and light utility to freeze (stop) browsers when screen blanks on linux - ColasNahaboo/browser-freezer