I have had enough of web pages arbitrarily changing the cursor focus. Enough of typing half of a URL into the URL bar and half into the text box that stole focus. Enough of typing half of a password into a password box and half into the text box that stole focus. Enough! If you have had enough, check out the NoFocus Greasemonkey script. This script prevents pages from changing focus during page load and, optionally, for the entire life of the page.

This is not a new problem. It has been discussed before on superuser and elsewhere. There are also alternative solutions, such as using Firefox's Configurable Security Policies to disallow focus, or using another Greasemonkey script such as NoFocusForYou and Disable Focus on Window Load. However, NoFocus has several advantages:

• No exceptions are thrown, as with CSPs. Most page authors are not expecting focus to throw exceptions (rightly so), and when this happens it will often completely break the pages by preventing the remainder of the script from running.
• Disables focus immediately (well, in the DOMContentLoaded event, when Greasemonkey runs its scripts). Other scripts only disable focus changing once the load event has fired, which doesn't address focus changes before this event occurrs.
• Disables focus changes for all elements currently on the page and all dynamically created elements. Rather than disabling focus for the elements on the page during load or DOMContentLoaded, this script disables focus for all elements current and future.
• Provides warnings when focus change is prevented. Inevitably, when debugging a page sometime in the future, we will forget that focus changing is prevented (if only briefly) and will fail to understand why a page is not working as expected. NoFocus counteracts this problem by using the Greasemonkey logging to write a warning message into the error log that focus change has been prevented. Making it easier to determine why focus is not performing as expected.

I hope you enjoy the script and enjoy not losing focus!