Russ Harvey Consulting - Computer and Internet Services

Browser Extensions

Adding features to your browser

Privacy Extensions | Password Extensions | Search Extensions
Other Browsers | About Extensions

Firefox browser add-ons links to Mozilla's add-on site.

I strongly recommended using Firefox as your primary browser. Most of the information on this page relates to Firefox, but you can check extensions for other browsers.

About Firefox Addons

Mozilla uses the term “add-ons” to refer to three major forms of modifiers to Firefox:

Watch for Obsolete or Insecure Addons

Firefox now treats unsigned extensions with suspicion.

Watch for Mozilla “permissions” warnings, particularly on older and potentially unmaintained addons. When clicked, the following text appears:

Some addons ask for permission to perform certain functions. Since you're in control of your Firefox, the choice to grant or deny these requests is yours.


Please note this add-on uses legacy technology, which gives it access to all browser functions and data without requesting your permission.

Installing these addons is risky. You should uninstall them if they are currently present.

Extensions Can Become Unsupported

Like any software, extensions can become unsupported or may contain elements that spy on you or are otherwise insecure.

[I]t's not uncommon for extension makers to sell or lease their user base to shady advertising firms, or in some cases abandon them to outright cybercriminals.
Brian Krebs

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Recommended Extensions

I add these basic Firefox extension to enhance the user experience on most installations (some are available for other browsers):

Web developers will want to check out my listing of useful Firefox extensions for web developers.

Privacy Extensions

Privacy is virtually impossible to recover once it is lost.

Marketing and advertising agencies are doing their best to downplay its importance, but they really don't want you understanding the true value of what you're giving away for free.

[T]here is another reason websites track you — It's because you're worth a lot of money. Websites record your activity so they can sell your information to third party advertising platforms, essentially delivering ads that they hope are relevant to you.
— Check Point blog

Most of these third-party advertising companies have NO privacy policy. They take anything they can grab and use it without any social conscience.

As users became more aware of tracking using cookies, these sites have moved to sneakier tactics like browser fingerprinting which can't be detected and is much harder to protect against.

Malware in Ads

In addition, there has been a huge increase in malware in online advertising and some ad networks have been used to spread ransomware. Ads play havoc with expensive data plans on mobile.

Ad Blockers Even the Score

When you use an ad blocker, many sites complain that they can't operate without the advertising revenue.

This is a hollow argument because Google and Facebook control all but a minor portion of online advertising revenue.

If you wish to support a site, subscribe or provide a donation. Any other collection of data is merely an attempt to cull information that can be sold to others.

An earlier version of Ghostery's “alert bubble” displays a list of 27 trackers found on

Look at the 27 trackers found on the website (shown in a legacy version of Ghostery).

This overkill in trackers is one of the factors that cause slow page load times and the loss of privacy.

On the tools front, there are browser plug-ins such as Disconnect Private Browsing, Privacy Badger and Ghostery. Installing any one of these tends to administer a salutary shock, because they instantly reveal (and enable you to block) the startling number of snoopers who are covertly tracking your online activity.
The Guardian

Recommended Privacy Extensions

These extensions are designed to protect your privacy.


Ghostery lets you see who is tracking you online (including information on their privacy policies). It stops beacons, ads, analytics services, page widgets and other third-party page elements from secretly tracking your every move.

Ghostery provides very precise details and gives you a great deal of control. However, it is more difficult to avoid “breaking” pages when your Ghostery settings are set for better privacy.

Privacy Badger

Privacy Badger blocks spying ads and invisible trackers by enforcing the Do Not Track header (you have to have “Do Not Track” enabled in your browser).

See Mozilla's Do Not Track FAQ.

I tend to install Privacy Badger rather than Ghostery on most client's computers.

HTTPS:// Everywhere

HTTPS encrypts your communications with many major websites, making your browsing more secure.

HTTPS:// Everywhere checks for HTTPS versions of a site and loads that rather than an insecure HTTP version.

This extension is no longer necessary. Most browsers now allow you to enable HTTPS-Only mode.


ClearURLs protects your privacy by removing the portions of web addresses (URLs) added for marketing and tracking purposes.

This extension will automatically remove tracking elements from URLs to help protect your privacy when browse through the Internet.

You've probably noticed extra content pasted onto the end of web links when you click on an email or when following a link. These include (but aren't limited to) adding the source of the link and its purpose.

Firefox has this feature built-in. When you copy a URL, select “Copy Without Site Tracking.”

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Password Extensions

Passwords are necessary for any site that requires you to log-in to gain access, but if they are not managed properly, your privacy and security are put at risk.

People have far too many passwords these days to manage without a password manager since everything from your email and social media accounts to utilities and shopping sites require a strong and unique password.

While all web browsers have built-in password managers, these are not secure.

Choosing a Password Manager

LastPass was my choice for a long time, but the 2022 LastPass breach demonstrated the company was negligent in both security and in warning its users about insecure settings. It also took far too long to warn users that their password vaults had been compromised, issuing a press release just before Christmas when it would likely go unnoticed.

My recommendation is to move to Bitwarden, before changing all your passwords.

If you are or were using LastPass, I strongly recommend that you find an alternative, then change all your passwords.

My recommendation is to move to Bitwarden, before changing all your passwords.

Learn more about password managers.

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Google is set as the default search engine on Chrome and Firefox. Google never forgets and its dominance is now skewing the meaning of truth on the Web.

Startpage & DuckDuckGo preserve your privacy.

My preference for StartPage is simply because I've used it longer than DuckDuckGo has been around.


StartPage provides search results from Google in complete privacy!.

Open StartPage then look for Add to Firefox or get the extension directly:


DuckDuckGo also provides simple Privacy Simplified

Open DuckDuckGo then look for Add DuckDuckGo to Firefox or get the extension directly:

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Extensions for Other Browsers

While this page focuses on Firefox extensions, many are also available for other browsers.

Chrome Extensions

Chrome extensions are available in the Chrome Web Store.

These extensions can be used on most Chromium-based browsers including Microsoft Edge and Opera.

Safari Extensions

Safari extensions are available in the Apple App Store.

Apple Enhances Safari Privacy

Apple made significant changes to Safari in 2018 to fight ad-tracking and digital fingerprinting, starting with Facebook.

One of the methods of tracking is looking at the extensions added to a browser. Apple plans to stop allowing extensions in Safari so that all Safari profiles are similar, defeating extension-based tracking techniques.

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About Extensions

A browser extension is a small software module for customizing a web browser.

Extensions can be installed in your browser to add features or simply customize what is there.

Plugins Once Provided Access

Plugins are obsolete addons that once provided support and access to "helper" applications already installed on your computer.

Examples of plugins are Flash, Java and Apple QuickTime.

Most browsers have either deprecated or ended support for plugins which have been replaced with native HTML5 technologies that are safer and faster.

Extensions are Self-contained

Unlike plugins, extensions are not dependent on existing software. Extensions are installed in your browser and are complete on their own.

Privacy Issues

Extensions can impact your privacy.

Most need some access to your bookmarks, browsing history or other personal information just to be able to what they were installed to do.

Firefox now treats unsigned extensions with suspicion.

Mozilla generally warns you when there is a potential security or privacy issue, and asks whether you want to provide an extension access to private windows.

Test Your Privacy

Panopticlick is an online test that analyzes how well your browser and extensions protect you against online tracking techniques, even if you are using privacy-protective software.

Be Selective with Installations

Like any software, be selective in what extensions you install. There is always the potential for poorly-written extensions to cause crashes or slow down your browser.

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Updated: June 11, 2024