If you have already read all three articles about the effective use of gmail with
lifehacker.com and / or “loaded” your gmail to its fullest extent much earlier, this post is not for you.
Now we will learn how to teach gmail with a light hand movement:
1. many hotkeys (you can add your own).

2. Go to, add, delete labels by typing the first few letters of these.

3. Color labels in different colors.

4. On the right click on the conversation print balloon tip with the content of the letter.

5. Save searches
6. Show icons for attached files.

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and much more.
Fast path (it is impossible to add new hotkeys, etc. but
actually fast ): install a lotion called
BetterGmail (
here you can read about it ).
Extensions is nothing more than a collection of scripts for Greasemonkey, so there is a
way for real Jedi :
install
grasemonkey if not previously. Wake up to
Greasemonkey Christmas ,
Hack Attack: Supercharge your Gmail ,
Lifehacker Code: Better Gmail (Firefox extension) , do not forget about
searching on userscripts.org .
We choose what we like, install, watch, rule, watch, install, write ours, and so on. (do not forget
to share with the habra people )
PS In lifehacker.com articles, they also talk about how to encrypt messages with PGP, connect gmail as a virtual disk, etc.