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Longdo Dict Add-on for Firefox

This add-on is for Firefox users who love Longdo Dictionary, one of the most popular English/Thai online dictionaries service (


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  • Right click translation: right click on a selected text and choose "Translate in Longdo"
  • Search: click on the extension icon, type in a keyword and click search icon to search
  • [Optional] Double click search: double-click on any word to view its meaning in a small pop-up bubble
    • To use this feature, do a right click at the extension icon and choose "Manage extension" > click "on" > click "save" > reload web page or firefox

Important : Note that all extensions are disabled on Firefox Web Store pages (including this one). Do not try the extension on this page.


Longdo Dict Firefox Add-on


GNU General Public License 2.0