Firefox Default Browser Agent

Firefox compatibility: This changes the user agent string to be more 'like Firefox' in that it uses the application version for its engine revision (rv:xx.xx) and including both a Gecko/x and Firefox/xx.xx slice in the user agent. When you’re done and want to switch back to the default Firefox user-agent, re-open the User-Agent Switcher and Manager pop-up window and click the Restart tab if you selected Window back in step #6. If you selected Apply so that the new user-agent was applied to all of your tabs and windows, instead of clicking Restart, click the Reset button.

Starting Firefox 75 onwards, with every Firefox installation, Mozilla will run a scheduled task on Windows named “Default Browser Agent” to collect information about users OS default browser setting, Firefox maker believes this helps them to understand user choices and engage with them when they’re not running Firefox actively. Last month Mozilla said the scheduled task has gone through data review.

If you install the Firefox version that releases on April 07, 2020, the Firefox installer will create a Default Browser Agent application and a scheduled task to run the agent. The following information will be sent as background telemetry ping to Mozilla once in every 24 hours.

Firefox channel name, version number, Windows OS version, OS_ locale, Current default_browser, and Previous default browser.

You can find the agent and scheduled task at the following locations on your computer.

C:Program FilesMozilla Firefox

Task Scheduler > Task Scheduler Library > Mozilla

Disable Firefox Default Browser Agent

If data collection aka telemetry or the agent preference is disabled in Firefox, the browser will respect (that as well as the policy if you create any to turn off its scheduled task) and won’t send your Windows Operating system’s default browser data to Mozilla. For that,

I. 1. Visit about: config

2. Search for agent, in the highlighted search results, change default-browser-agent.enabled pref value to false.

II. 1. Click on menu > options > Privacy and Security > Firefox Data collection and use

2. Uncheck everything, done.

Bonus: Here is how you can delete the scheduled task.

1. Click on start menu, search for Task Scheduler, open it

2. Expand Task Scheduler Library > Mozilla, select Firefox Default Browser Agent task

3. Click on disable or delete.

Mozilla believes telemetry is one way to understand default browser trends to improve its browser.

Collecting telemetry is one way we’re able to ensure we can understand default browser trends in a way that helps us improve Firefox. It’s our hope that by better understanding more about our users and their choices around browser preferences, we can continue to build a better Firefox.

Here is how you can make Firefox browser as default on Windows 10:

1. Open Settings > Apps > Default Apps > web browser

2. Click on the browser displayed and select “Firefox” to make it as default.

Recently after switching to Chromium, Edge has surpassed Firefox to become the second most used browser in the world with 7.59% and Firefox has fallen to third place with 7.19%

Google Chrome and Mozilla Firefox come with built-in features that allows users to change default user agent, however, it is not possible to define a particular user agent on a per-site basis. If you want such a functionality, have a look at User-Agent Switcher for Chrome and UAControl for Firefox – both these extensions allow you to set specific user agents for certain domains you want.

User-Agent Switcher for Chrome

Install the extension from Chrome Web Store and head over to its settings – chrome-extension://djflhoibgkdhkhhcedjiklpkjnoahfmg/options.html. In the left menu, click on Permanent Spoof List.

Then enter the domain of the particular website, choose the desired user agent you want to assign from the dropdown menu, and click on Add. That’s it. Refresh the page and you should see your selection in effect. Extension icon in the Chrome menu shows the active profile.

All specified domain are listed below the form, from there you can delete it later if you want.

UAControl for Firefox

Firefox Default Browser Agent Free

Install UAControl and restart Firefox to enable the add-on. After restart, go to Firefox menu > Add-ons > UAControl > Options. This will open a dialog window as seen below:
Here, click on Add Site, enter site domain, choose Custom and enter the custom user agent you want, and hit OK to save changes.

Unlike the extension for Chrome, in UAControl you need to manually enter user agents. If you need a list of that, have a look at useragentstring.com. On this site you will find user agent strings for crawlers, web browsers, mobile browser, link checkers, and a lot more.

Firefox Default Browser Agent -

That’s all. After the initial setup process you don’t have to worry about these settings anymore. You can continue using your browser as you normally do, and websites would behave the way you chose.

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