Install Random Signature Quotes for Gmail™ from the Chrome Web Store.
Copyright 2013, James Mortensen
I made this extension because I couldn't find a tool to let me randomly inject my own user-selected quotes into my email signature. I specifically wanted the quotes to be hand-selected.
Since there wasn't an existing solution, I made one.
To replace the quotes with your own, edit the quotes.js file. You may use HTML markup, but be sure to escape your quotation marks!
Alternatively, if you don't want to hack the code, on the right side of the address bar in your Gmail tab, click the page action icon and edit the JSON array with your own quotes. Just be sure to save that data to a backup file, just in case!
In case it isn't clear, this is licensed under the MIT License. So do with this what you please.
// @history 0.9 initial beta release to the public in Github
// @history 0.9.2 initial beta release to the public in the Chrome Web Store with Stack Exchange flair import support
// @history 0.9.2.2 Added in more quotes, upgraded jQuery to 2.1.0.