Here is another Google Chrome Extension by Mr. G himself. A small but really useful extension for those use dictionary while surfing the web. Like me !
With this extension, you can  Double-click any word to view its definition in a small pop-up bubble and view the complete definition of any word or phrase using the address bar dictionary.
Supported monolingual dictionaries:
- Chinese, Simplified (䏿–‡ – 简体)
- Chinese, Traditional (䏿–‡ – ç¹é«”)
- Czech (Český)
- Dutch (Nederlands)
- English
- French (Français)
- German (Deutsch)
- Italian (Italiano)
- Korean (한êµì–´)
- Russian (РуÑÑкий)
- Spanish (Español)
and let me know your thoughts !

WHY YOU DON’T HAVE ARABIC LANGUAGE
Yes, Why Arabic not supported?
cause Arabs are sleeping
you are waiting that Americans translate for you?
Thanks Khadidja for these words which give me a courage to find a solution to this problem by my self.
I don’t know if it is legal or not but to have Arabic just do the following steps:
1- Install the dectionary from link: https://chrome.google.com/extensions/detail/mgijmajocgfcbeboacabfgobmjgjcoja
2- Open installation folder, It will be here (replace XXXX by your user name):
C:\Documents and Settings\XXXXX\Local Settings\Application Data\Google\Chrome\User Data\Default\Extensions\mgijmajocgfcbeboacabfgobmjgjcoja\2.0.4_0
3- Open File (options.html) with notepad.
4- Add the following after after :
Arabic
5- Save and close.
6- now if you go to extension options you’ll find arabic there.
7- Enjoy Translation.
Note: this can be done for any language but should be available at file (lang_map_js_min.js) which available in the same folder.
Sorry, Step 4 not appeared properly because html tags not allowed to be written in this comment:
4- Add the following code after “language_picker”> :
{option id=”ar” value=”ar”}Arabic{/option}
replace all { bye because I can’t write them here!
again replace all } by > and all { by <