[silentprog]

This functionality is (sort of) already possible in firefox (and possibly other browsers) and I use them quite often, the only problem is that managing them is not as straight forward.

An example bookmark which allows you to search on npm:

Set url to: https://www.npmjs.com/search?q=%s add keyword: npm

Now when typing 'npm <some_random_package>' in the url bar, it will execute the bookmark and link to https://www.npmjs.com/search?q=<some_random_package>