AFAIK all modern browsers offer the ability to turn off JavaScript globally. Add-ons such as NoScript for Firefox give you more control though. I use NoScript to have all JS disabled by default on a page, and turn on/enable specific sources as necessary. On zencastr, I noticed that the page wasn't loading so I temporarily white-listed the site, and it is visible now.
A common and, IMO not-unreasonable view is that all content on the web should be viewable on the web with just HTML and CSS (sometimes even without the latter) and thus JS should never be required save for specific tasks such as in-browser computation and the like. That's a bit extreme for me, so I just white-list scripts as needed.
A common and, IMO not-unreasonable view is that all content on the web should be viewable on the web with just HTML and CSS (sometimes even without the latter) and thus JS should never be required save for specific tasks such as in-browser computation and the like. That's a bit extreme for me, so I just white-list scripts as needed.