In addition to ba's answer, vajehyab.com and dictionary.abadis.ir, which are not dictionaries by themselves, but provide you access to دهخدا, معین and عمید which are major contemporary Persian-Persian dictionaries. and دهخدا and معین do in fact show the diacritics, though not in a usual way.
i.e. they only shows the letters that do have a diacritic (in ...
Google dictionary extension
With this extension, you can:
1) Double-click any word to view its definition in a small pop-up
2) View the complete definition of any word or phrase using the
3) Store a history of words you've looked up, so you can practice them
Foreign words are automatically ...
Google Translate Anywhere is available for Firefox and Chrome, and I believe for Opera as well.
Basically, it opens Google™ Translate in a frame (of a customizable size) straight over your page. You select a text, right-click to invoke a Context Menu, and choose the option. The extension captures text selection and allows to choose source/target languages, ...