Add an option to switch browsers

[Legedith]

This is something not related to the issue, but can it work with chrome instead of firefox?

Originally posted by @haardikdharma10 in #2 (comment)

[Legedith]

You can change 'firefox' to 'google-chrome' in the code and it should work fine.
Maybe you can add an argument to ask user their preferred browser and switch accordingly.

[dufftt]

I have tried trickle -s -u 100 -d 100 google-chrome as well as trickle -s -u 100 -d 100 /usr/bin/google-chrome but trickle doesn't seems to work with google-chrome