How can I stop a web site from taking over my browser?
Example: When I visit a web site, it blocks my keyboard short cuts such as copy and paste.
I want to use these short cuts when I need them.
Disable JavaScript.
If there is a specific site you use a lot that does this, you could use a Greasemonkey script to re-enable the thing they took out, but I don't think that is a general solution.