I'm using the Googlebar Lite addon for years now. One feature I especially like is its displaying the search terms on the bar itself (in that crazy screenshot taken from the Mozilla site: the "firefox" term at the end; the second screenshot better demonstrates it), and when you click it, basically initializes an on-page search for the clicked term. Very convenient when examining pages behind result links, especially longer ones.
Unfortunately, that addon is limited to Google. I'm looking for something comparable, which also works with other search engines (e.g. DuckDuckGo). It does not need to have all of the other bells and whistles (feeling ducky, all those other icons on the bar, etc.).
What it basically should support:
- multiple search engines, at minimum Google + DuckDuckGo (optional: let the user configure more search engines)
- display search items on the bar to be clicked for an "emulated Ctrl+F"
- possibility to start different searches by key-kombos (e.g. Ctrl+Enter for a picture search, Alt+Enter for a map search), ideally user-definable
- drop-down with all possible search actions (including the ones from previous item). Ideally, user can select which of them should be active/visible here (to keep the list clean)
- possibility to easily switch between search engines
- possibility to open searches in a new tab
- when offering additional icons on the search bar (feeling ducky etc.), I want to be able to deactivate that (need the space for the search terms to click ;)
- possibility to hide that (additional) search bar (as it's possible with Googlebar Lite)
- privacy stuff (e.g. disabling caching/history, if there's any)
- easy-access to search-engine specific functionality (like DuckDuckGo's !bangs, or switching off Google's auto-correct)
- bloatware additions
- tracking additions
- other adware "features" (oh, maybe you want to buy that at... No, thanks!)
Also accepted: Ways to enhance Googlebar Lite with support for additional search engines ;)
Postscriptum 2017-06-19: With the addon not e10s (multi-process) compatible and being discontinued (so no chance it will ever become e10s compatible), I'm even open to suggestions just resembling the very one but being actively maintained and e10s compatible.