WebExtensions has limitations in terms of functionality.That being said, these extensions continue to work great in the browser. Some of the old add-ons have been abandoned, the developers have stopped their development.It would seem that redo it and everything will be fine. The developers have been warned about this in advance so that they pass their extensions under WebExtensions. Only add-ons written in WebExtensions will work in the browser, and 'outdated' extensions will be disabled in the browser. Unfortunately, the update had some negative sides, namely, add-ons written using XUL, SDK, and XPCOM stopped working in Firefox 57 Quantum. Firefox is less prone to errors and crashes - this opinion was put forward by experts. Another advantage of Mozilla Firefox, which competes with the most famous browsers, is protection against malicious sites.Confidentiality is ensured thanks to the Prohibition of tracking user actions.Firefox download is advisable for more convenient work with interactive services. The improved performance of the browser makes it faster (five times Firefox previous version).You can also create tab groups so that they are always in quick access. A quick switch function is available, making it much easier to find the service you need.

Allows you to use the pinning of tabs, which is very convenient for users who often use certain services.

A modernized minimalist design, a bit like the simple and straightforward Google Chrome.

Starting from version 57, Firefox browser has many features and advantages: If we turn to the reviews of regular users, the fastest are the versions from Mozilla on the Quantum engine, that is, all products released from 2017 and later. Therefore, it is better to familiarize yourself with the functionality of a particular browser version in advance before installing it. The most common question from users is - which of the older version of Firefox browser should I choose? This question does not have a clear answer, since a lot depends on the version of the operating system and on what functions are important for you when working on the Internet.

How to use Firefox older versions for web testing.

How to find and download Firefox old versions?.

Why do people need to use older versions of Firefox?.

How to get older versions of firefox