firefox-dictionary
Installation link: https://addons.mozilla.org/en-US/firefox/addon/popup-dictionary/
Dictionary WebExtension for Firefox. Double-click on any word to get a definition and pronunciation audio for that word.
WebExtension for Firefox that provides Google Dictionary for Chrome-like functionality (except prettier and with more bugs).
JavaScript
Installation link: https://addons.mozilla.org/en-US/firefox/addon/popup-dictionary/
Dictionary WebExtension for Firefox. Double-click on any word to get a definition and pronunciation audio for that word.