easy
simple
best

Its great., however can I suggest one feature:

Would love for a few of the searches to be directly on the right click menu rather under the Context Search drop down menu.

I used to like this addon, but lately enabling it causes FF to crash often for some reason.

This one now deletes my custom search engines whenever I open the browser, but it used to work perfectly. Hopefully, there will be a fix for this soon. I appreciate all the hard work done by the developers to make a great add-on.

Super ultra mega útil .Ótimo !

A good addon providing powerful search features.

Hi Olivier. Thanks very much for this extension and your time spent developing it. It replaces a now deprecated extension and is very valuable to me. I am having an issue with 3.72 that others have reported. Namely, when I delete a search engine the list of search engines disappears. A refresh brings it back, but this adds a lot of time to the removal process.

Very useful and easy to customize! Everyone should try it. Thank you for your work

Spent twenty minutes trying to edit the search engine list, buttons don't work half the time, and deleting an entry often causes it to reload with an empty list. Refreshing the page brings it all back, but then the buttons to move entries up and down the list stop working.

Configuring the list really shouldn't require this much effort.

Avoid until it gets fixed.

Hi, v. 3.72 is broken in Waterfox win 64. it shows the menu, but it does nothing. I rolled back to 3.69 and it seems to be fine.

Been using this add-on for about a year and other than a couple small issues it works great.

Ordering the list of search engines is a little tedious.

I can't say I'm happy with the exif reader in 3.72, I'd like to have an option to remove it.

The updated extension as already reported by others currently doesn't work as before. It's nearly unusable.
Unfortunately the author added also a functionality which thematically doesn't fit at all with search engines: An Exif Viewer for jpgs.
For me an extension stuffed with random functions which don't belong to each other is nearly worthless. I already have an Exif viewer as extension.
It's a pity for a wonderful extension it was. I'll continue to use the old version without Exif Viewer.
An issue on Github with the request to delete the exif viewer has been refused. Which absolutely isn't a problem but that tone used "Tough luck ...", "go use another" left me a bit puzzled. Not the most diplomatic way to communicate with its users ....

It's a very usefull add-on but the last update broke it. The context menu dissapeared from right-click options...

Love the Add-On, hope you manage to fix it soon.

addon is also broke for me but I saw the replies so I know dev is trying to fix the problem. Can only cheer on with a 5 star review while I await the fix...

==edit April 6==
I think the addon is fixed for me now! Thank you so much for the quick fix!

Unfortunately, the add-on v 3.71 has stopped working again, the context menu was gone. I am very upset!
Old versions of FF has crashed at start!
Today It hasn't been worked. Then I have REinstalled (latest) firefox. I previously saved the file of my own search engines (synchronized with my firefox account for lovely addons, saved my browser bookmarks - it did not need to be restored). It has been start working. :) But I have lost S3.Translator. This addon required own reactivation solutions.
Now I using only old version 3.69 which available right-here.

Using v3.71 but the options menu in the context menu keeps disappearing intermittently. Can't wait for the fix. Excellent addon otherwise, one that I can't live without. Kudos to the dev.

EDIT:

Thanks to the dev for a swift response and update. Works perfectly now.

Suddenly, this add-ons made self-updates and deleted all my favorite search engines! Besides, I can't even customize them anymore, I can't delete unwanted engines. I can't customize settings. FIX THIS PLEASE!

[RE] : I saved a BACKUP of my custom search engines as well! But as the settings are getting restored automatically, the option "Force reload of default search engines list" gets marked, then I loose my custom engines.
NOTE: All of this happened with the firefox 62 I made update just after this, thinking it was just a matter of compatibilty.
Anyway, looking forward to get good news soon!

It's a great addon, but it don't recognize the search engines I had in firefox and the import option needs a .json file that I haven't.
EDIT: Well, I can export json file but when I import json file, only have "undefined" search engines.