Today I discovered a wonderful Google extension, its name is Mainichi (毎日 - Every day). This extension makes every time you open a new tab in Google Chrome, a letter appears showing a word in Japanese with an image, the form written in kanji and hiragana / katakana.
A perfect way to increase your vocabulary, and help memorize words. You can install this extension by clicking here.
Taking advantage of the article, I will mention other extensions that I use in Google Chrome that helps me learn Japanese.
Rikaikun - This program is English, but with it you can follow each Japanese word in your browser, see all the details, ways of reading, related words, pronunciations of a kanji and its meaning in English. To download Rikaikun click here.