(edit)
New option "Remember Search History" is ready for the next release. Unchecking this option prevents search terms from being stored.

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can do

(edit 8-20)

Looks like using the sidebar isn't too viable right now with the API limitations
* no POST capability (no page injection for POST code, sidebar not considered a TAB)
* can't open sidebar from quick menu / toolbar search (only available to context menu searches)
* limited width unless user edits files in profile dir
* sidebar always opens on install for FF pre-62 (minor annoyance)

Maybe in the future when the API is a bit more robust I can look into it again.

(edit 8-19)
The web extensions API is limited in how sidebars can be opened. I can send search results to the sidebar, but I cannot OPEN the sidebar programmatically in some cases. This may effect usability.

(edit) I'm trying it out now. The sidebar width is limited but I've read it can be increased by making changes to userChrome.css . I can add the option to open search results in the sidebar under -- search actions -- without much additional code.

You want to open search results in the sidebar vs in a tab? Could you explain a bit more about how that would be useful to you?

The add-on does support internationalization. Right now there are translations for French and German. I'm always looking for contributors to translate into other languages. If anyone wishes to help, visit the support site on github and edit the files in the /src/_locales/en/ directory. (https://github.com/ssborbis/ContextSearch-web-ext/tree/native-app-support/src/_locales/en)

> By the way, if the right-click menu display position can also be customized (for example, you can choose to display the position under copy and paste), it is even better!

There is a setting for positioning the Quick Menu relative to the cursor with customizable pixel offsets. Do you mean moving the "Search for.." menu item higher in the context menu? Unfortunately, that cannot currently be done with the webextensions API

> - close after search

Ready for 1.6.3

> - empty search bar after search

The current behavior is to display the last search on a per-session basis. The last search should be highlighted, ready to be replaced with the first keystroke. Closing Firefox will clear the last search from the session storage. Adding the option is trivial but I'm not sure it's necessary. Specifically, what issue are you having with the default behavior?

(edit) This was not working properly under linux. Fix ready for 1.6.3

> One thing that bothers me is that modifying the default engines; removing tracking parameters for example, results in a 'name already exist' error. Which is bizarre.

That's a definite bug that must have popped up when I added the ability to change the name. I'll fix that today.

(edit) 6-13
v1.6.0.3 should fix the problem

> 1) Javascript/Bookmarklet support.

(edit 6-15) Ready for v1.6.1

>Edit:
>Use short javascript snippets for more advanced local operations e.g. Find&Replace all instances of a word in a text box or copy and format selected text as bbcode, etc.

Are you wanting to access bookmarklets from the context menu when using the option to manage search engines via bookmarks? If you have a github account, start a new topic at the support site so I can get more info.

> 2) Search button: Save search history / always show last query
> 3) Search button: Make autocomplete optional

(edit 6-14) Ready for v1.6.1

> 4) Search button: Match browser theme

(edit 6-14) Having some problems with this one. Can't seem to get color values for built-in themes like Dark. I'll keep on it.

> 5) Search button: Support middleclick
Ready for v1.6.1