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Pro tip: Ctrl+Alt+R in firefox :-)

This appears to do absolutely nothing.

Reader mode. The key combination will change by OS.

Looks like a Windows combination to me and it's not what FF uses for the Reader mode.

Maybe he's talking about reader view which, for me, can be enabled with F9 or clicking the icon in the address bar (https://support.mozilla.org/en-US/kb/firefox-reader-view-clu...)