Very good UX and a wide range of supported dictionaries. One thing I hope the extension will support is the ability to change theme (light mode and fontsize of the popup).

Well done! This is exactly what I wanted.

It's a good add-on save for one thing.....it prevented me from updating to the latest version of Firefox until I removed the add-on!
It can be a five star once this is rectified.

This is the best pop-up dictionary app I've found yet! I love being able to customize what search engine I want a pop-up definition from. I just wish I didn't have to make two clicks to get a definition from the website I want though. It should have the option to be fully automatic with one click.

EDIT: I wonder if it's possible to add a button for this addon to the toolbar for the SSS addon?

https://addons.mozilla.org/en-US/firefox/addon/swift-selection-search/?utm_content=addons-manager-reviews-link&utm_medium=firefox-browser&utm_source=firefox-browser

This addon solves the need of using lookup on macos. Thank you @river young

Out of all the add-ons I have this one is by far the best

Excellent functionality without clutter and does not look ugly like other translator add-ons, really nice UI and UX.

EDIT7 Great, 5 stars. Many Thx.
EDIT5 [ED6You were right, it 'was' not in 'screen2' but in [non-existing] screen3. Solved] Hi. Sorry, i don't have "Right click on the small preview window of the dict, there is a "move" item in the context."; maybe in w10 [which i despise], this is win 7.
Anyway even if i can enable this preview in win7, i have tried shift-win right or left arrows wich move apps between screens, and nope, also i add a tv as 2nd and there's nothing in the borders or in it. *This worked*: i right click the window item in the windows taskbar > 'close window'. Then in FFox 'recently closed windows' i reopen it, then it appears ok. So this is kind of 'solved'. (If the punctuation signs [, " :] interfering with words recognizing issue is not only me or win7, i guess i would stop coming here... i would imagine somebody else would put an issue in Github...) Many thanks.
EDIT4 Ehh i'm not that good reader, with "to not have to stop the auto-scroll" i meant just to not have to do extra clicks, not that i can read while the page moves constantly; i move over or under the "auto-scroll" symbol to faster find up or down where i want to read, then 'park' on the "auto-scroll" symbol to stop the moving, to read calmly [thre's a little reading while still moving but mostly it's when it's stopped] , "auto-scroll" is useful to move fast trough long pages and to not have to click the side navbar. Thx.
EDIT3 Sorry, i don't like the manipulation/censoring/spying of the current overlords of social networks so i'm not in twitr etc. i can 'clean' this post later if you want...
I'm using the English def dicts and some for other langs.
What i meant is [i'm using "Automatically select the word underneath when moving mouse" and "Enable floating definition of seleted word, support multiple languages" without "Need to hold the key..."](this while auto-scrolling {as activated by middle-click} through a page): words immediatelly followed by the punctuation signs ":" or "," or " " " wouldn't be recognized if i hover the mouse pointer over them [they get highlighted *with* the punctuation sign, so no floating pop-up appears]
[it works if i double-click the word so the punctuation sign is not included, but the idea is to not have to use clicks, to not have to stop the auto-scroll ]; *and if the word is in the middle of a 'linkified' sentence, double-clicking it is not an option...*]. Examples, won't produce pop-up:
word"
word,
word:
EDIT2 It stopped working 'suddenly' without i having installed or changed any addon. Maybe this has something to do: when it failed, i had 2 FFox windows, one was custom sized so i could see other program besides FFox at the same time.
I don't use Telegram or Discord; if its hard to replicate, no problem, i can live without the 'window'.
Another thing: some signs after the words causes them not to be recognized eg: ___" ___, ___: . Thx.
EDIT No, after updating to v2.5.1 still the window [not in fullscreen, +- a quarter in size, centered] briefly appears, then invisible. Thx for caring.]
Hi. originally it worked all ok, but now when i click on the icon, the 'new window' appears very small and very briefly, then disappears as if it were 1px x 1pxl or 0pxls, [in windows taskbar it appears so i can close it there, but the window itself is invisible].
I tried uninstalling the addon and reinstaling, restarting FFox [win7] , but still invisible. In case this is because some other addon or unresolved, please put an option to make it appear not in a new window but in a new tab.
[The floating def is working; please consider making it gone with a 'wiggle' of the mouse/moving the mouse in then out of the poppup, so not need to click to make it off].
Also, it would be nice if the user could choose what appears in the floating def, eg the def + translation/s to chosen langs.
When the 'window' worked, i could choose what dictionary to use there [but one at a time].
Thx.

I was searching for an extension like that for ages, thanks!

Hey River,
Pretty good addon with only noticeable issue at the moment. Clicking on the pronunciation button often causes a lag in the voice , it hangs or repeats even after clicking once.

Brilliant!

Finally a decent tweak-able Dictionary extension for Firefox. Keep up the good work, it's quite good, I am thinking of replacing my existing dictionary extensionson chromium browsers with this one.

非常好的扩展，界面也很漂亮。请问能否实现用户自我添加词典的功能？比如我想添加linguee.com等目前列表里没有的词典或翻译界面。非常感谢！

Excellent, works very well and it's very useful.

Would it be possible to add other languages? I am particularly interested in French dictionaries such as:
https://dictionnaire.lerobert.com/
https://www.cnrtl.fr/definition/
https://www.larousse.fr/

Or, indeed, would it be possible to customise the app ourselves and add the websites we need?

Thank you!

Easy to use! Can download and export the history into excel sheet.

thank you for this extension, but when i click on the words the box doesnt appear. also can you add korean dictionary like naver and korean standard dictionary? thanks again