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Mozilla Firefox for fast and reliable browsing. The best browser if you're looking for speed, safety, and privacy. Firstly, let’s cover Firefox’s most famous feature: privacy. Developed by the non-profit group Mozilla Corporation in 2002, Firefox is a free open source software, and the source code is publicly available for download. Firefox is independent and a part of the not-for-profit Mozilla, which fights for your online rights, keeps corporate powers in check and makes the internet accessible to everyone, everywhere. We believe the internet is for people, not profit. Unlike other companies, we don’t sell access to your data. Use Searchfox, Mozilla's online search and browsing tool for accessing the source code. This isn't a good way to download the code, but is a great way to search it. Firefox Source Code Directory Structure Learn about the various folders in the Firefox source tree, and how to find what you're looking for. Good first bugs.
About Mozilla Mozilla exists to build the Internet as a public resource accessible to all because we believe open and free is better than closed and controlled. We build products like Firefox to promote choice and transparency and give people more control over their lives online. Learn more at https://www.mozilla.org. How to download netflix for macbook.
It’s hard to go anywhere on the internet without seeing an ad. That’s because advertising is the predominant business model of the internet today. Websites and apps you visit every day are largely “free” for you because they monetize your data and your attention through advertising. And, as data sets of individuals and groups online have become more readily available to companies in recent years, advertisers have developed strategies to minimize what they spend on ads while maximizing the profit made from them. The ad tech arms race is constantly evolving, and the more invasive practices that are used, the more valuable your data is. Here are some of the most common online advertising strategies and associated activities being used that rely on collecting data about you today.
Targeted advertising
Targeted advertising is when you are shown an advertisement based on something specific an advertiser thinks they know about you. Advertising technology providers have become adept at creating profiles about you based on what you see, read and click on online (and sometimes what you do offline, too – like what you purchase with your credit card). Advertisers use these profiles to serve you with ads that they think you’re more likely to engage with than others. Targeted advertising is often used by companies so that their dollars aren’t wasted on consumers who won’t find their product or service valuable. Some people enjoy receiving targeted ads because they may be relevant; others feel uneasy about receiving targeted ads due to the fact that their information has been collected and shared by companies they’re not aware of.
Targeted advertising is an umbrella term that encompasses many of the more specific strategies that follow in this article (like retargeting, contextual advertising, cross device tracking, browser and device fingerprinting, and behavioral profiling).
| Example In planning for your friend’s bachelorette party, you search Amazon for decor to make your friend’s weekend special. In the weeks that follow, Amazon serves you ads on other sites showcasing products commonly bought for bachelorette parties that you might be interested in. Amazon could have used a range of targeted advertising strategies to do this, such as retargeting, cross-device tracking, or behavioral profiling. |
Retargeting
Ever feel like an ad is following you around online? It probably is, and this is the result of retargeting. Retargeting happens when a cookie hitches a ride with you from one website to another, or when a company tracks your logins or device IDs from one time and place to the next.
| Example You casually browse through Redfin to see what real estate listings are available in your area. You then log into Facebook to scroll through your timeline and catch up with friends. Lo and behold, there’s a Redfin ad in Facebook’s right hand column. Redfin was able to show you an ad, retargeted to you after you left their platform. |
Contextual advertising
Contextual advertising is when you’re shown an ad based on the content of the website you’re on. Reading an article about sports? If you’re shown an ad for a sporting goods store while you’re on the page, it’s plausible that the advertiser didn’t use personal data at all to get their ad to you, but instead simply relied on the content of the page itself to suggest whether or not you might be interested.
| Example Your New Year’s resolution is to swim more. You read an article on Shape.com about the benefits of swimming to motivate yourself. In the right hand column, you see an ad for CoolSculpting, which may be contextually advertised to you based on the content of the article you’re reading and nothing more. |
Cross-device tracking
Cross-device tracking enables ad tech companies (including Google, Facebook, and data brokers that sell your information to advertisers) to track you across multiple devices such as smartphones, television sets, tablets and computers. These companies can use your identity (e.g., your login information), the fact that your devices all use the same home network, or even ultrasonic signals to create your data profile across more than one device. For example, one such form of this tracking uses audio beacons, or inaudible sounds, emitted by one device and recognized through the microphone of the other device.
| Example You research 5G in your computer browser because you want to better understand both the skepticism and also the potential of the technology, and you read several articles on news websites to get perspective. Later that day, when you log into your New York Times app on your phone to read through today’s top stories, you see a Verizon ad about their 5G products. How did the news app and advertiser find you on your phone if you were only browsing for 5G information on your desktop? Cross-device tracking could be the culprit. |
Browser and device fingerprinting
Fingerprinting is used to identify you through your browser or device, based on their specific and unique configurations. Fingerprinting technology was initially developed with good reason: to help make your browsing experience better. For example, fingerprinting has historically helped with online image rendering across different devices. Today, fingerprinting is highly attractive to advertisers because it’s possible to collect information about you and target you with advertising, even if you browse with tracking protection or regularly clear your cookies. This makes fingerprinting one of the most invasive strategies for advertising.
| Example Recently, Geoffrey A. Fowler of The Washington Post wrote an expose on online fingerprinting. In his piece (republished here in the Denver Post without a paywall), he asserts that fingerprinting is happening on sites you wouldn’t think would be intrusive, like AllRecipes.com. So maybe that’s why you saw that Williams Sonoma cookware ad there last week (as someone who recently researched Instant Pots while being vigilant about your privacy settings while you did so). |
Behavioral profiling
Behavioral profiling is a specific kind of tracking that records, measures and analyzes information about the specific things you do on a website or across multiple websites. The idea is to gain information about the kinds of activities you do, interests you have, the way that you act and the way that you react. For example, an advertiser using behavioral profiling might try to determine whether you are an “impulse buyer” or a “sale seeker”. This kind of profiling can be used to give you recommendations about products and services that you might be interested in. However, it may also potentially exclude you from offers or content based on your behavioral profile.
| Example Your fur-baby is your first-born and your best friend. You generally spare no expense when it comes to buying your pup the perfect food to fit her dietary needs, or that festive bandana for the upcoming holiday. Your data profile online might suggest that you love dogs and that you are happy to spend a sizable portion of your disposable income on them. Hence why you receive a Furbo Dog Camera ad on Instagram, which could have used behavioral targeting to reach you. |
Dynamic pricing
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Dynamic pricing is the practice of pricing items at a level determined by your perceived ability to pay. Dynamic pricing algorithms can target you and profile you based on the data that they have about you, such as your location, search and purchase history, the number of times you’ve visited a site, and the device you are using. Dynamic pricing itself isn’t an advertisement or an advertising strategy, but it’s often used in complement to advertisements in order to prompt purchasing behavior.
| Example You’ve been researching flights from Washington, DC to Hartford, CT, and today when you log in, you see that the price has gone up to $1,080 for roundtrip fare. The cost may seem outlandish, but American Airlines has deemed you and others able to afford — and be willing to pay for — this ticket. American Airlines conveniently places a booking button right in the Google Flights interface. |
Data brokering
A data broker is often an important intermediary to executing advertising strategies that rely on the use of your data. A data broker collects information about individuals from public records and private sources. The data they collect is combined through efforts like data matching (finding data about you from multiple sources and linking them) and audience matching (building your profile based on ‘lookalikes’ – people who behave similarly to you online). Through these efforts and others, data brokers are able to create profiles of you, often made up of thousands of individual pieces of information. Data brokers sell the information they collect about you to companies and government agencies to make their profit.
| Examples Large data brokers include Acxiom, Experian, Epsilon, CoreLogic, Datalogix, Intelius, PeekYou, Exactis and Recorded Future. |
You can reduce what advertisers know about you
Advertising isn’t going away anytime soon, and it probably shouldn’t, as it supports publishers and content creators. And, many of the things that enable advertisers to track you (like cookies) are likely here to stay too. At their best, they make your life easier by storing information and improving your web experience. At their worst, they exploit your vulnerabilities and take advantage of very personal information. But, you do have the power to limit what advertisers know about you. Here are five easy ways:
- Use technology that respects your privacy. The Firefox browser blocks trackers by default — over 10 billion every day — so more of what you search for and click on is unavailable for the types of advertising and tracking in this article. And, Firefox automatically blocks known fingerprinters, so when you use Firefox, you reduce your individual profile for advertisers based on your laptop, phone, software, add-ons and preferences. Here’s where you can download the Firefox browser.
- Use an ad blocker. Ad blockers prevent ads from displaying in your browser. Because you see and interact with less ads while using an ad blocker, data brokers and the companies they serve collect less data about you. Here’s a curated list of ad blocker extensions that have been reviewed by Firefox’s security team as safe.
- Avoid signing into websites and apps through Facebook or Google. Instead, create unique usernames and passwords.
- Limit the apps on your phone to the essentials. There are thousands of apps out there that maintain their existence by sucking up your data and selling it to third parties. The buying and selling of location data, for example, is big business and can be quite invasive, especially when it’s combined with other data about you.
- Turn off mic access on your computer and phone. Deactivate “Hey Siri” or “Okay Google” and disable mic access for your phone apps. Head over to System Preferences on your Mac or PC to turn off mic access as well.
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A note about Firefox advertising
You might have seen a Firefox advertisement in an email from the New York Times. Or, maybe you’ve heard a Firefox promotion on a podcast you enjoy, like Judge John Hodgman or Wait, Wait, Don’t Tell Me. 360 by deezer app will not play music. Firefox does indeed advertise, and we do it with integrity. We put your privacy first and foremost, from the products we make to the marketing campaigns we run. Advertising strategies like site retargeting, third party or non-consensual cross-device tracking, device and browser fingerprinting, and the use of data brokers are things we don’t do. Our focus is and has always been people over profit.
Related reading
The word “privacy” gets thrown around a lot these days, but every tech company defines privacy differently. Respecting your privacy has been at our core from day one, with the Firefox Personal Data Promise baked into everything we make. Everyone who uses our products — from the browser and beyond — gets powerful privacy protection, and when you join Firefox, you get even more features.
Here’s what you get when you join Firefox:
Products that respect
Watch for account breaches with Firefox Monitor
Seems like every day there’s news of another data breach. That’s why we partnered with one of the most respected online security experts to help you know when your personal info is exposed. Firefox Monitor lets you check your email address for known past breaches, and even sign up for ongoing alerts. When you join Firefox, you’ll be able to monitor multiple email addresses, and keep track with a dashboard for all your accounts, monitoring and alerts.
Take your passwords anywhere with Lockwise
When it comes to protecting yourself online, passwords are your first line of defense. But, strong passwords are complicated and can be a hassle to retype over and over. That’s where Firefox Lockwise can help. Lockwise remembers your passwords, keeps them safe behind a wall of code, and lets you take them everywhere on your phone, tablet and desktop. On Android or iOS.
Trade fake news for quality content with Pocket
The internet is filled with rabbit holes you never meant to fall into (hello, insomnia). Pocket is just what the doctor ordered. It helps you make the most of your reading time by surfacing the content you care about, from legit sources, consumable in all the ways you like to “read.” Listen to an article on your commute, take your reading offline, catch up on great videos, tuck into a story at bedtime. And carve out a quiet space on the internet that’s all yours.
Own your life on every device with sync
You probably expect just about all your devices and apps to let you pick up where you left off, from one device to the next. But actually, not all browsers do this. When you download Firefox and sign in, you can sync your browsing history, bookmarks and preferences without giving your privacy away, thanks to our super-private end-to-end encryption. Sign in and sync Firefox across your Android and iOS devices (phone, tablet, laptop, you name it).
Knowledge that protects
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Knowledge is power. Learn everything you need to know (but don’t yet) about staying safer and smarter online. Get the scoop on products that put your privacy first, and learn how to navigate the evolving landscape of the web. You might not be an expert and that’s okay—we’ve got plenty of them, and they’re happy to share what they know.
Community that transforms
Firefox was built by a community of people just like you. Volunteers all over the world contribute to the code of our browser. Community is what keeps Firefox awesome, and it’s also what will keep the internet open, free and accessible to all. Join us, and you’ll get a chance to test-drive new features and products to make Firefox better for everyone. And, you can help us keep Big Tech in check by adding your voice to the fight for a healthier internet.
Join Firefox
Firefox doesn’t just talk about privacy. We’ve been on the front lines of protecting your privacy long before it was an ad campaign for other companies. When you join Firefox, you’ll get the respect that you deserve from a technology company that fights for you. Now is your time to take a stand against an industry that’s making you the product. Join Firefox.
There is a way to protect your privacy.
Take your stand against an industry that’s making you the product. Join Firefox for the respect you deserve from a tech company that fights for you.
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