We have already covered After the Deadline, the online service to check common mistakes in your writing. After the Deadline was recently acquired by Automattic, the company behind WordPress.
Now, After the Deadline has provided a bookmarklet which can easily check spelling mistakes, misused words, redundant phrases and grammar errors.
How to use After the Deadline Bookmarklet?
Drag the bookmarklet to your bookmarks toolbar from this page. As bookmarklets are the easiest extension to browser, you don’t need to do any special effort to use it. Whenever you need to check your writing, click the bookmarklet and it will load the After the Deadline checking button above every textbox on the web page. Click this button to check the errors.
Unfortunately, the bookmarklet does not work with Chrome browser. :( Also, it works only with textareas.