Definitely the Best Search-addon. Nearly perfect.
Unfortunately the sidebar feature is not working (Firefox & Chromium)..

Not quite as polished as the screenshots would suggest. But certainly the functionality for this extension is beautiful.

*The sidebar doesn't seem to be displaying anything ... But the button for the extension is working just fine.

Działa, choć kłopotliwe dodawanie nowych własnych wyszukiwarek. Ale idzie ogarnąć.

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Why search working from firefox search, but not from quick search (open main site page)?
Also can edit search engine, but can't save (auto save if is, not working)?

Powerful and nice design, but it does not allow to add new custom search engines... (as it is impossible to add in Firefox too...). So quite useless. I prefer the extension "Context Search WebExtension" which allows custom search engines.

Edit: Thanks for your quick answer.
Actually I hide the Firefox' search text box in order to save space for all my addon icons + my bookmarks in toolbar... (It would be so great to have an additional bookmark toolbar... before I used Classic Theme Restorer which allowed it). So I can't see the green "magnifier" when Firefox detects a search engine.
On top of that, the majority of the websites I use don't have an OpenSearch compliant search box. For instance www.discogs.com.
So I find the Firefox OpenSearch standard search engine too restrictive. This is not a critic against your addon, but this is a critic to Firefox.

Install a tiny open-source app to keep your search engine list updated autom.
It is much better if you insert this open source plugin into itself. And if possible, when I install the plugin, pop up window is set

Nice replacement for the old Context Search add-on which I started to miss bitterly right after Firefox 57 came out. Something like this should REALLY be standard in Firefox.

That said, getting the add-on to work in "Automatic" mode on GNU/Linux (Ubuntu, in my case) was a bit of a hassle. The instructions on the GitHub site could be more helpful here. They put too much focus on the location of ContextSearch.json (no, DON'T put that file or anything else under /usr/lib/ or /usr/lib64/, these are to be maintained by your package manager alone) and leave more important points unmentioned.

To make a long story short, I had to do the following:

(1) Put ContextSearch.json and ContextSearch.py from the git repository into ~/.mozilla/native-messaging-hosts/.

(2) Make ContextSearch.py executable (chmod u+x) AND convert it from CR/LF (Windows) to LF (Unix) line endings so that python can actually run the script. (I also changed the shebang to #!/usr/bin/env python).

(3) Change the path value in ContextSearch.json to the actual location of ContextSearch.py (why doesn't it just default to ContextSearch.json and ContextSearch.py being in the same directory?).

(4) Enter the path of my search.json.mozlz4 file in the add-on's preferences.

And hey not-quite-presto, everything works! Well, apart from a few details, like search engines using POST rather then GET requests not working but showing up in the context menu. All in all, a promising extension with a few rough edges.

Finally a WE context search addon that gets it right. Or as right as its currently possible to get it in the new, crippled Firefox. It's still not automatic, but that's a consequence of Mozilla's decision to dismantle all traces of a decent UI. Now at least we don't have to maintain two separate lists of search engines.
Thank you.