Last updated on : 2022-06-30
CSS Levels 2 and 3 only allowed the :not() pseudo-class to accept a single simple selector. For instance, :not(a), :not(.b), or :not([c]) did not work. Level 4 introduces support for lists of selectors in :not(). For example, :not(a, .b), [c]) can be written as :not(a), .b) and [c]).
To make a right testing strategy it's important to understand how many users are actually using Firefox 21
To help you build the right browser testing matrix, here's the overall marketshare of both Firefox browser and Firefox version 21.
Data Source: Statcounter.com
Data Source: Statcounter.com
To create a automation testing strategy for checking your webapps on Firefox 21, you first need to check what technologies are supported on Firefox 21.
Here's a list of all web technologies categorized by thier support level for Firefox 21.
Browser Support For IE Versions
Browser Support For Edge Versions
Browser Support For Firefox Versions
Browser Support For Chrome Versions
Browser Support For Safari Versions
Browser Support For Opera Versions
Browser Support For Safari on iOS Versions
Browser Support For Android Browser Versions
Browser Support For Opera Mobile Versions
Browser Support For Chrome for Android Versions
Browser Support For Firefox for Android Versions
Browser Support For Samsung Internet Versions
The Mozilla Corporation & its subsidiary, the Mozilla Corporation, developed Mozilla Firefox, or simply Firefox, a free and open-source web browser. Firefox displays web pages using the Gecko rendering engine, adhering to current and future web standards. It is a significant player in the market.
Mozilla Firefox was created in 2002 under the code name "Phoenix" by Mozilla community members who wanted more than a single program in their Mozilla Application Suite bundle. Firefox's beta version gained popularity with testers and was praised for its speed, security, and add-ons compared to Microsoft's then-dominant Internet Explorer 6.
In 2004, Mozilla released Firefox, challenging Internet Explorer's dominance. In nine months, Firefox had been downloaded more than 60 million times. Firefox is the successor of Netscape Navigator as it was created by Netscape in 1998 before its acquisition by AOL.
Firefox comes with a few useful features. For example, Firefox has tabbed browsing with individual processes per tab, a built-in pop-up blocker, private browsing, phishing detection, and a sandbox security model. One feature of Firefox that's vital to some users is that it works on multiple platforms.
Visit the official website of Mozilla Firefox to download the Firefox browser version.
LambdaTest allows LambdaTest allows you to instantly spin your website on Mozilla Firefox browser versions 4 and above.
Test this and other features on your website for compatibility across 3,000 real browsers and devices using