Changing Javascript of the browser - Firefox [closed] - javascript

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Just like we can change browsers user-agent with some add-on, is there any add-on or way to change browsers Javascript that shows in whoer.net?
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If you want to disable javascript in mozilla firefox, then yes indeed that's possible. Here is the official article explaining it.

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Best way to understand javascript complex code? [closed]

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What is the best way to understand javascript complex code, like I use to debugger for understand the java complex code.
So, there is any way for javascript like java?
you can use either IE/Chrome Developer Tools, press F12 on the browser and afterward put any breakpoint on javascript file.

Can someone tell about this new HACK programming language from facebook [closed]

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I cant find many resources about it on the internet. I would like too look into this more and what similarities does it have with javascript!
It's not very Javascriptlike at all. It's more like PHP + static type annotations. It compiles to the HipHop Virtual Machine, for which Facebook has a JIT PHP compiler as well.
The resources that exist publicly are all at hacklang.org.

how does getElementsByClassName() work under the hood? [closed]

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I've tended to just loop over elements selectively to find elements of a specific class, but I'm curious if using getElementsByClassName (for applicable browsers) will increase performance at all.
How does it actually WORK?
I could easily run a test to check performance obviously, but I'm really curious what's going on in there anyway.

Hide information in window.screen [closed]

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Is it possible to instruct Firefox to hide the information contained in window.screen?
According to this paper [1], it can be used for tracking purposes.
Thank you.
[1] https://panopticlick.eff.org/browser-uniqueness.pdf
no, it's not possible. for example:
screen.width=999;
alert(screen.width); // shows: 1920

Knowledge graph/table for web developer [closed]

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I've seen general chart for programmer level (knowledge of paterns\oop\langagues\testing etc.)
Is there any good chart to evaluate your knowledge of web development(CSS\HTML\JavaScript\SVG\client-server communication)?
Check this
http://smarterer.com/
It's a free skills Benchmark. You will find several quiz like CSS/HTML/SQL/ASP/jQuery/Javascript...
Pros : Questions are created by website users :)

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