You may not know you need it, but you need it.

I was using Ubiquity for this purpose but it wasn't optimal and was abandoned.

Finally a userscript that works out of the box! yay!

Just see: http://userscripts.org/topics/68688

At the time of writing this, 22nd Jan 2011 1311h GMT, this script works perfectly.

Thank you!

A really simple, but invaluable script. I wish all scripts were this great.

Does the job and easy to access. Can't ask for more.

This is just great. I just wanted strikethrough in Gmail for the first time and tripped up over the lack of button. I tried copying and pasting into Word and adding the formatting there, but the font got changed in the process and making any further edits after I pasted back into Gmail proved quite troublesome.

So I went and found this script and it did the trick just peachily! Thanks so much.

Firefox 3.6.6, GM 0.8020100408.6, in case that's useful to anyone who's having trouble.

Does just what it says on the tin – adds a completely unnecessary much-missed button, allowing you to add snark subtlety to your emails.

Many thanks to the kind author.

This is one of those things you don't even realize you miss that much when moving from a full desktop application to a web app until someone points it out. That happened to me a few months back and I've been suggesting the feature to gmail ever since. I was very happy when I came across the script. It didn't work at first but the author was very responsive and with enough feedback, fixed it within hours.

Any chance of adopting this script to add the button to google docs apps? The feature is there, but a button to use it would be awesome.

Anyway, great script and great author. Thank you.