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I am a research assistant and i am pro member of Vocabla.
plug-in does not work properly in almost all scientific web sites.
Idea is great, but there is need to be improved of this plug-in.
My first comment on Firefox Addons. This addon is awesome. Sync all your words between web, mobile (Anrdroid, iOS, Web). This addon easily add your memorizing words to your word list directly.
There's always English word you read or hear that you don't understand. Vocabla helps you translate, collect & memorize words - it's a mix of vocabulary tutor, social network and shareable media library