PUBLIC MARKS from decembre with tags courrier & addon

As you can see, this add-on packs a wallop, including many of our old (and new) favorites such as the Macros script (for many more keyboard shortcuts Gmail should really have in the first place), an Unlabelled label hack and a Filter Assistant which brings that handy email client functionality of building filters from a currently selected message. Of course, one could run out and find all these scripts on their own, but Better Gmail takes the clicking out of that process and wraps all this great stuff into one handy extension, complete with the ability to disable it all in one fell swoop in case you need to get back to Gmail's basics.