It works fine. It's a little "noisier" than Rikaichan, with pretty big reading bubbles, and bizarrely defaults to using the middle button (i.e., the "new tab" button) for lookup.

The big, big, big, big, BIG problem is that it does not seem to work on webmail (Gmail). Without that, it barely even begins to replace Rikaichan.

:)

It does everything rikaichan and rikaisama did (apart from customizable shortcuts of the latter).
The only real drawback is being stuck in sticky mode (but it's going to get fixed).

You won't find a better 57+ alternative, that's for sure.

I was a heavy user of rikaichan and also rikaisama. Must admit, I always neglected the Anki-integration in any of these addons (as I'm not using Anki) but instead focused on the "dictionary" functionality.

As both, rikaichan and -sama have had problems for a long time now, I was forced to reduce my usage of these addons. I updated to Firefox 55 today, marking both addons as legacy. Because both are no longer in development, I decided to finally remove them as there's no point anymore.
Just by coincidence I found this addon and it does essentially all I ever wanted. It works absolutely great and is more than just a replacement.

I have no idea how I missed out on this addon. I did a bit of googling and queries like "rikaichan alternative" are not turning up this addon at all. I hope it will get picked up by search engines eventually and the word spreads further.

The functionality of this addon is top notch. For people who came here searching for a rikaichan/sama replacement: you found it.

There are two changes in "design" from rikaichan I want to highlight/mention:
a) Scanning key. It doesn't process all text under your mouse constantly but rather requires a push-to-talk-like key. I actually wished for this in rikaichan already, so I welcome this change.
b) The dict results are unified while in rikaichan you toggled/switched the result pages of each installed dictionary. I must admit, I'm not yet sure what's better as both approaches have their merits.
Yomichan's unified output shows you all the information in one view, that's great for an overview of all the stuff. Also the kanji integration/kanji information presentation is way superior to rikaichan's "switch to kanji-dict result page"-approach.
However, yomichan unifies all dictionaries (except kanji) and while there's a point in e.g. unifying JMDICT and KireiCake results, I wouldn't want JMnedict results "in the same view" as I don't see them contextually fit well with each other. Granted, the illustrated example should be rather rare.
I also enjoyed in rikaichan having the English JMDICT results as first page and my native language's JMDICT results on a sub-page because occasionally I liked to check how they translated stuff into my native language. But that's something I rarely did and probably not a widely needed use case. I assume in yomichan multiple languages would also get unified but I did not test that yet.

I have yet to check how yomichan works on HiDPI displays as rikaichan/sama acted up on these (incorrect positioning of the popup, i.e. not at the highlighted words). It should work though, as I'd assume webextension technology transparently handles such stuff.

Overall, yomichan is imo not just an alternative to rikaichan but more like a successor. More than rikaisama ever was.

I installed this to replace rikaichan which isn't likely to get ported to WebExtensions.

So far this allows me to do everything I wanted to do with rikaichan and more. I don't use this to create flashcards which is a shame because the developer has apparently put a lot of effort to Anki related features, but a nice upgrade from rikaichan is the interactive popup with a good layout and within it the stroke order diagram of characters that I click.

Grouping results by kanji+reading also makes a lot of sense when multiple dictionaries are used (thank you for EPWING support!), although JMdict isn't exactly designed for it and sometimes the same definition is listed multiple times (example: すばやい shows both 素早い and 素速い with identical definitions).

Thank you for the great work!

I've been using rikaichan for 2 years and I wish I found this right at the beginning. The anki integration is absolutely orgasmic, the UI is fantastic and the usability is genius.
It took the idea of rikaichan and boosted it to its maximum potential.
Before I had to MANUALLY add thousands of cards and onyomi/kunyomi, it was tiresome. This is addon integration with anki is simply genius, it's noob friendly and customizable to your liking.
I've created kanji cards with automatic onyomi/kunyomi/meaning... Adding cards feels like a breeze.

I have no idea why this addon is that much unpopular it's by far greater than any of its concurrent... I can never thank the developer enough for this.

I've been using Firefox for 4 years and I CREATED A FIREFOX ACCOUNT ONLY TO RATE THIS.

To the dev : Papa bless, love ya

Allowing the standard dictionary files from the website to be downloaded directly into the extension would make the installation for first-time users (like me just now) a lot simpler, but it's no biggy either way :-).

Great extension!

A solid replacement for Rikachan and especially Rikaisama (if you need Anki import). Works fine on the latest Nightly v54.
But it could definitely use some features from Rikai- extensions like customizable hotkeys and pop-up, and a manual word lookup.