Firefox and Chrome are about to reach version 100, and the User Agent UA function will be castrated.

Firefox and Chrome have always been competitors, and their version numbers are relatively similar. Now, both version numbers have been updated to more than 90, and there are not many versions away from the official version number 100. .

The currently confirmed news is that both companies will cancel an original function after version 100, which may cause a large-scale impact.

The theme of browsers in the past two years has been to protect privacy. In order to achieve this goal, both products have launched a series of privacy protection measures, such as preventing tracking, reducing web page permissions to reduce shared content, and prompting web page positioning. and other sensitive information.

After these two companies update to version 100, they may cancel the UA function of the browser. Once cancelled, it may affect many web pages.

So, what is UA?

UA stands for User Agent. To put it simply, it is a string that identifies user information. This string allows the website to obtain user-related information.

Generally speaking, UA will contain the following information: browser name, operating system version, browser kernel version, and if it is a mobile browser, it may also include mobile phone brand model and other information. Moreover, different browsers have more or less UA information.

For example, the following is a piece of UA information

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:94.0) Gecko/20100101 Firefox/94.0

We can get some information from this information, such as Windows 10 system, 64-bit, using Firefox browser version 94.0.

A common place is to display user information in comments. For example, comments on the Ruhe website will display the browser version and system version used by the user.

Seeing this, many friends will say, there is nothing wrong with this, and judging what browser I use is not considered privacy.

Due to the submitted browser information, some web pages will not serve some low-version browsers, and it is even recommended to download some 2345, Sogou and other browsers.

Some web pages will display different content according to different browsers. For example, some web pages have no ads on Apple devices.

There is also something that is criticized. You must have seen it before. It is disgusting. It is also judged through the UA string to guide users to use their own products. It looks ugly.

The judgment method is also based on the UA string. The UA content of Baidu APP is as follows:

Mozilla/5.0 (Linux; Android 11; M2102K1AC Build/RKQ1.201112.002; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/76.0.3809.89 Mobile Safari/537.36 T7/12.16 SearchCraft/3.9.1 (Baidu; P1 11)

As you can see, Baidu has added its own content: [Baidu; P1 11], but when accessed using this UA, it will not prompt to open it in the APP.

As users, we actually don’t want others to know so much information. It is enough to know whether I am using a computer or a mobile phone. The browser version is enough. As a developer, I want to obtain users' detailed information and provide users with "better" services.

As a piece of information, UA is widely used. If Chrome and Firefox remove it, it will indeed cause a lot of trouble, such as determining whether the user is mobile or computer. However, now it is more encouraged to create responsive websites. There is no need to build separate mobile and computer sites.

At present, the draft has been released, and Client Hints will be used to replace UA. I believe it will be implemented slowly in the future.

These changes, to a certain extent, will promote changes in the website. Do you want to cancel this feature?

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