Is there a browser extension for romanizing kana and kanji?

Question

Browsers

I'm looking for a browser extension that, when hovering (or clicking) on ​​an element containing hiragana, katakana, or kanji, would give a neat popup with a romaji text option.

Answer 1

Solution found: rikaikun for Opera.
Romanization of the word is completely absent, but there is a dictionary and a more useful feature - transcription of syllables.