I'm using Ranger as my default file manager on Linux Mint. I can't figure out how to make Ranger open HTML files in Google Chrome.
Copy the example rifle.conf
gunzip -c /usr/share/doc/ranger/config/rifle.conf.gz > .config/ranger/rifle.conf
And add ext x?html?, has google-chrome,  X, flag f = google-chrome -- "$@"
 above line 57
If you want to open a new window everytime, add --new-window to the command

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