You may be aware of the GitHub’s largest DDoS attack in history on Mar. 27, 2015 (some context, technical details, and discussions):

We've been under continuous DDoS attack for 24+ hours. The attack is evolving, and we're all hands on deck mitigating.

— GitHub Status (@githubstatus) March 27, 2015

One important technique when facing this kind of problems is blocking certain sites’ JavaScripts in your browser. Here, we introduce the 2 simple steps to block a certain site’s JavaScripts.

Step 1: Open “JavaScript exceptions” in Chrome

Open “JavaScript exceptions” in Chrome by simply opening this address in Chrome’s URL bar:

chrome://settings/contentExceptions#javascript

Step 2: Enter the blocked site and block it

For example, to block all JavaScripts from example.com, input

[*.]example.com

in the “Hostname pattern”, and select “Block” in the “Behavior” column.

Ok, it is done.