The 'insert-link' command let's you find and insert a url from your history.
Finding the url works just like the AwesomeBar. As you type characters, matches from your history get displayed. Then you can select which one you want to insert.
Read on for more details and to install.
Here's a screenshot of this command in action:
For comparison, here is a screenshot of the AwesomeBar showing the same suggestions as the 'insert-link' verb:
After you install the command, open any page with a textarea, run the Ubiquity command "insert-link" and start filtering your history.
I must say that it is exciting to have access to the guts the browser like that. Experimentation is much easier with the command editor than writing full-fledged extensions, at least for simple things.
On the other hand, the debugging experience could be improved. I have not found how to debug commands or inspect the styling of the previews.
Also, this level of access poses a clear security risk, which will be an interesting challenge to address moving forward.