Works great and fast, great communication with developer on GitHub.

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.

Perfect extension for replacing Firefox's built in context menu search which is fairly limited.

At this moment this extension is the best contextual menu searcher. It made me update to FF 57. Thank you very much.

Very handy Context Search is Back in different Shape!!!

Works just like the old contextsearch plug-in on the old firefox version. Added functionality of the quick buttons is a nice touch and being able to resize them is a good option on screens with a very high pixel density.

Update: 5 stars now. Developer quickly added an offset option. Great developer!

A nice replacement for the Context Search pop-up I was using with FF56. One thing that would make it nicer would be an offset option. Currently the auto-pop-up automatically appears over top of the text you had highlighted. The old Context Search plugin I used allowed you to offset the X and Y of the popup by a number of pixels so it would appear where you want it.

Other than that, the only other thing that sucks is Quantum's inability to let you easily add search engines to the search bar, which does limit the use of this plugin somewhat, though that's not the developer's fault.

edit4: (1.1.2.5)

yes this version works nicely here too, tried it near the scrollbar, with and without zoom.

excellent support as always, thank you!!

Quick Menu doesn't appear by holding either of the mouse buttons. But it worked once with a Press Key option.
57.0.2 (64-bit)

UPD: Holding mouse buttons works but not on every website. It works, for example, on youtube.com but doesn't work on addons.vaultpit.io.

REPLY: All the websites, I've been using within last 24h, work. Thanks for clarification.

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.

I am so satisfied. ^^
Thank you very much.

If you right-click the text while dragging, pop-up will open. It works very well with the search engine.
If there is a wish, do not drag the text, right-click (slightly delayed) pop-up opens
It can also be used as a substitute for bookmarks.

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I am sorry for not being able to explain properly.
I am very satisfied with the present and I am using it well.
It is perfect even if you do not modify it anymore.

In the current state, dragging a text and right-clicking or left-clicking opens a search engine pop-up.
It is very good. Leave the current functionality intact

The point of the article is to click anywhere in the web page with the mouse (left click or right click)
It was a personal idea that I wanted to run pop-ups.

Thank you for developing a good program.

I have nothing but thanks for the developers who made this. I don't understand why this hasn't been added to Firefox's core functionality yet. Ever since the Firefox 57 upgrade disabled the old Context Search app, I've been frustrated and annoyed. Finally, I have something to replace it!

The best context menu add-on bar none. The Quick Menu feature is brilliant.

Best context search webextension for Firefox 57! The only one defect is the quick menu with right button... sometime the Firefox menu overlap on quick search. Maybe is better if the button to hold is the left. For all the rest, thank you!

(edit) Sorry for my bad English, but yes, sometime when i hold down the right button i have the Firefox context menu and the addon quick search together. Anyway the problem is solved with addon version 1.0.3 and the new feature, THANK YOU SO MUCH for this little miracle in webextension!

Exellent! I've waited for this moment.

great great great great great great addon!
Thank you

Import files every time 「search.json.mozlz4」
Too trouble

I hope

Just make a right click
with the mouse pointer on top of *the page's* search box

can choose Add to Search

Just great. Thank you so much.

It lives!
Thanks mate, so far so good, the demise of Ben's extension was driving me bonkers.
5 stars :)