Firefox is a secure browser and is the basis of the privacy-focused Tor Browser. Depending on the level of security you want, you'll need to put in some work to lock down Firefox. The configuration is a breeze, so it doesn't take long to get the secure browser you want. To get started, follow these Firefox security best practices.
Enable Do Not Track
The first and most basic thing you can do is enable the Firefox built-in Do Not Track protection. Do Not Track is good, but it's not foolproof. Many sites, including the malicious ones, ignore it. Still, it's a good thing to have enabled by default.
Open Firefox, then select the main menu icon in the upper-right corner of the screen.
Go to the left panel and choose Privacy & Security.
In the Send websites a "Do Not Track" signal section, select Always.
Increase Your Tracking Protection
The latest versions of Firefox include built-in tracking protection. The standard protection provided by Firefox is good, but you can take it a step further.
Go to the main menu and select Preferences.
Go to the Privacy & Security tab, then scroll to the Enhanced Tracking Protection section. Firefox is set to Standard protection by default.
If you want more control, scroll down and select Custom. The Cookies, Tracking content, Cryptominers, and Fingerprinters check boxes are selected by default. Leave these selected.
Select the Cookies drop-down arrow, then choose All third-party cookies.
This option warns you that some sites may break, but this is a rare occurrence.
Select the Tracking content drop-down arrow, then choose In all windows.
In the past, malicious add-ons were used to target Firefox. Now, there are fantastic security add-ons that make a difference in keeping the browser safe.
Open the main menu and select Add-ons.
From the Add-ons Manager page, go to the Find more add-ons box and enter HTTPS Everywhere.
In the Search results section, select HTTPS Everywhere.
In the HTTPS Everywhere section, select Add to Firefox.
When prompted to confirm the add-on install, select Add.
Firefox installs HTTPS Everywhere. The add-on redirects to the encrypted version of a website automatically, if one is available.
Firefox container tabs compartmentalize your browsing to keep cookies and trackers from following you between sites. This feature is built by Mozilla, the makers of Firefox, and helps contain invasive sites.
Change Your Search
Firefox gives you a choice of search engines. If you don't like the default search engine, here's how to change it:
Open the main menu and select Preferences.
Go to the left panel and select Search.
Scroll down to Default Search Engine and select the drop-down menu to choose a new search engine. Of the default options, DuckDuckGo is the most secure and private.
After you set a default search engine, your searches through the address bar and new tabs go through that search engine. There are other options that you can get through add-ons. A couple of good options are:Startpage: A private search engine that doesn't track you.Ecosia: A moderately private engine that uses its profits to plant trees.