It really shines for me, since I have pentadactyl installed in my firefox. From the blank tab page, I can be searching github (or the python docs, or <insert one of the multitude of !searches here) with the following keystrokes:
o !github language:python
'o' tells pentadactyl to go to a url. When I don't give it a URL it instead sends what I type to my default search engine.
The funny thing is that unless I am actually searching DDG, I almost never see it.
Sure you could do this by defining a whole bunch of search aliases, but it is more fun to think, "I wonder if I can search the Arch Wiki from here," type `o !arch some search`, and all of a sudden find yourself on the arch wiki search page.
Pentadactyl or vimperator. I can never remember which one is being currently developed. I mostly use vimperator on Firefox. Installed it as a total lark and found almost instantly that I loved it.
The funny thing is that unless I am actually searching DDG, I almost never see it.
Sure you could do this by defining a whole bunch of search aliases, but it is more fun to think, "I wonder if I can search the Arch Wiki from here," type `o !arch some search`, and all of a sudden find yourself on the arch wiki search page.