How do I check for viruses on Firefox?

To scan your computer with Malwarebytes, click on the “Scan” button. Malwarebytes will automatically update the antivirus database and start scanning your computer and Firefox browser for malware. Malwarebytes will scan your computer for browser hijackers, malicious extensions, adware and other malware.

Is Prefs js a virus?

As the prefs. js file is not a virus itself but a legitimate system file it should not be deleted. However, as long as the anti-malware software detects it as dangerous it is a positive trait that Mozilla Firefox browser or any Mozilla-based application is compromised by a spyware program.

What is user js Firefox?

js file of the Firefox browser by default in the future. If you have not heard about user. js before, it is a configuration file that controls preferences in the Firefox web browser.

How do I use user js in Firefox?

The prefs. js file already exists in your Firefox profile directory, find the location using about:support in the top bar. The prefs….Summary

  1. Find the location of your profile directory using about:support.
  2. Create a new file called user.
  3. Add settings using user_pref( setting, value );

What is user in js?

js is a file in the profile folder. The file name is incorrectly capitalized in the title of this article due to technical limitations in the software which powers the Knowledge Base. A user. js file is an alternative method of modifying preferences, recommended for advanced users only.

How do I clean up Firefox?

Clear the cache

  1. In the Menu bar at the top of the screen, click Firefox and select Preferences.
  2. Select the Privacy & Security panel.
  3. In the Cookies and Site Data section, click Clear Data….
  4. Remove the check mark in front of Cookies and Site Data.
  5. With Cached Web Content check marked, click the Clear button.

Do you need antivirus with Firefox?

There is no Firefox builtin Virus Protection or Firewall. Yes you need a A/V and a Firewall only. Go into Avast settings and turn all other stuff off, you do not need it then as you say.