Viewing the source code of a website is a standard function in all web browsers. A right-click usually opens a menu with the option to view the source code of the page. Source code only refers to html source code. There is no way to view Javascript or CSS source codes directly from those menus.
The Firefox add-on JSView adds that possibility to the Firefox browser. Installing the Firefox extension adds a new entry to the right-click menu which displays the amount of Javascript and CSS files that are referenced by the website.
Each file can be opened by selecting it. The source code of the selected file will be opened in the default source viewer of the browser.
The extension provides the option to view the source code of all Javascript or CSS files at once. The tool is especially useful for web designers.
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[...] Quickly View JavaScript Sources As a web developer myself I often find that I want to view the source of a JavaScript file for a particular site. This Firefox extension lists all of the JavaScript files associated with a site just by right-clicking on the page. Pretty nifty. [...]