The vBulletin software uses quite a bit, as newer versions come out it get's worse for older browsers or non updated JavaScript
This translates to downloading the latest version of the Browser.

I have always assumed JavaScript comes with whatever Browser you are using. If this isn't true, you could download both the latest version of JavaScript & the latest version of your web browser.

JavaScript is a programming language which people use to do fancy things on web pages.

On a more practical matter download the latest version of Chrome, FireFox, or Safari & the problem will most likely go away.

For some reason, I read these forums in Safari and do most of the rest of my web browsing in a FireFox variant. I'm kind of converting to Safari because it is faster on my machine.

Robert