There's a better way in Firefox.

In Firefox, go to Preferences -> Search and click on "Add search bar in toolbar". Also uncheck "Show search suggestions in address bar results".

Then ctrl-l will only autocomplete URLs and ctrl-k will search. Once you're in the search box, press TAB to cycle through your search providers. You can add additional search providers easily.

Slightly better still not there. If I have 15 search providers I have to press TAB 15 times to get to the last one, that is tiresome. I can search amazon/ebay/npm/rubygems/mdn/etc without looking at the screen or keyboard with chrome. I have probably >10 search engines I use daily.

You can set custom keywords that are the same as on Chrome. You just won't need to press TAB. I don't use that feature, but it's described here:

http://kb.mozillazine.org/Using_keyword_searches

I didn't think about adding sites like rubygems and mdn, but that's a good idea.

Edit: I just tried it and it works. Example: create a bookmark in Firefox and change the URL to the one below. Set the keyword to "r" in the bookmarks editor. Then you can type `r devise` in the address bar to search rubygems.

    https://rubygems.org/search?utf8=%E2%9C%93&query=%S

I guess I just need to choose better "keywords"

what does it mean full keyword? why would you want to use more than one letter? I have it set so that:

? - default search engine

w - wikipedia

t - dictionary

y - youtube

d - duckduckgo