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Shop Companion
Access to full-resolution product images and videos on various shopping sites is easy with this add-on. It adds links to the largest/xxl/best-size version of product images on various shoppings sites.
Open-source code on github.com/ShopCompanion
Duplicate Tab Blocker
Prevent duplicate tabs. Allow only one tab for a url. If you click a link that is already opened in a tab, then existing tab would be focused instead of opening a new tab. This works even across firefox windows.
Búsqueda en la barra de direcciones en Twitter
Mozilla Firefox con Twitter te conecta instantáneamente con lo que está sucediendo en el mundo.
Busca personas y temas en Twitter usando @ y # desde la barra de direcciones.
ArsTechnica Single Page Article
Shows a single page containing the whole multi page article.
ScrapBook AutoSave Improved Requires Restart
ScrapBook AutoSave Addon, with some extra features.
Словарь синонимовъ RU Requires Restart
Adds to browser Russian(RU) synonyms dictionary from package LibreOffice.
Share to Google+ Page Requires Restart
Share to your Google+ Profile or Google+ Page with just click of a button.
To create your own collections, you must have a Mozilla Add-ons account.