Detecting if "Find on Page" is activated
114740
Is there a way to detect find on the page searches in javascript
43156
How to pop-up alert to a user when he/she navigate away from page without saving the Records in custom visual force page?
11878
Identifying Between Refresh And Close Browser Actions
35455
How to detect if JavaScript is disabled?
158427
Is it possible to detect file location when running it?
158918
Check if a file was included or loaded
156630
How to check if page exists using JavaScript
15692
Is there a way to detect if a browser window is not currently active?
39458
How can I figure out how a search engine is finding hidden pages?
9887
How can I check if a background image is loaded?
156269
Show if a user is online, idle, or offline on their account page?
44048
How do I know if the page is in Edit Mode from JavaScript?
145793
Detect all changes to a  (immediately) using JQuery
66496
How to detect unsaved data in form when user leaves the page?
53283
how to make a browser/search engine ignore detecting current location
151266
Find out whether Chrome console is open
18525
How to check if an element is in the view of the user with jquery