What add-ons are and where to find them
An add-on is a small program or extension that plugs into software you already have to add new features or change how it works. Add-ons are different from updates — updates fix bugs or improve what your software already does, while add-ons let you do things the original software wasn't built to do. Common add-ons include browser extensions that block ads, media players that handle new video formats, and plugins that let your email program work with calendar services.
Where you find add-ons depends on what software you're adding to. Web browsers like Chrome, Firefox, and Safari have their own official stores — Chrome Web Store, Firefox Add-ons, and App Store respectively. Desktop programs like Photoshop, Audacity, and VLC often link to add-ons from their Help menu or official website. Mobile apps on iPhone and Android rarely use add-ons the way desktop software does; instead, they tend to bundle features directly into updates.
The safest add-ons come from official sources run by the software maker or from the software's official marketplace. These stores check add-ons before listing them and remove ones that break or contain malware. Add-ons from random websites or third-party stores carry more risk because nobody has vetted them.
Key Takeaways
- Add-ons live in official stores tied to your software — the Chrome Web Store for Chrome, Firefox Add-ons for Firefox, or your program's Help menu for desktop software.
- Installing an add-on usually takes three steps: find it, click Install or Add, and grant the permissions it asks for.
- Permissions tell you what your add-on can see and do — an ad blocker needs to see web pages, but it shouldn't need access to your passwords.
- You can turn add-ons off without removing them, which helps you figure out if one is causing problems.
- Stick to official stores and well-known add-ons, because add-ons from unknown sources can slow your device or steal data.
How to add an extension to your web browser
The process is nearly the same across Chrome, Firefox, Edge, and Safari. Open your browser and go to its add-on store — search "Chrome Web Store" if you use Chrome, or look for "Extensions" in the menu. Type the name of the add-on you want, or browse by category. When you find one, click the button that says Install, Add to Chrome, Add to Firefox, or similar.
A popup will appear asking you to confirm and showing what permissions the add-on needs. Read this carefully. An ad blocker should need permission to see web pages, but it shouldn't ask for permission to read your passwords or see your browsing history. If the permissions seem wrong, close the popup and look for a different add-on. If they look reasonable, click Confirm or Add.
The add-on installs in seconds. You'll usually see a new icon appear in the top right corner of your browser, next to the address bar. Click that icon to open the add-on's settings or menu. Some add-ons work automatically in the background, so you may not see an icon at all — check your browser's add-on list to confirm it installed.
Installing plugins and extensions in desktop programs
Desktop software like Photoshop, Audacity, VLC, and Blender handles add-ons differently than browsers do. Open the program and look in the menu bar — usually under Help, Tools, or Edit — for a link that says Plugins, Extensions, Add-ons, or Preferences. Some programs have a dedicated folder on your computer where add-ons live; the program's website will tell you where.
If the program has an official add-on store or marketplace, you can browse and install from there. If not, you'll download the add-on file from the program maker's website and place it in the correct folder. The website instructions will tell you exactly where. After you move the file, restart the program — it scans for new add-ons when it starts up.
Desktop add-ons sometimes need extra setup. A video codec (a tool that plays certain video formats) might need you to restart your computer. A Photoshop plugin might need you to point the program to where you saved it. Read the installation instructions on the add-on's page before you download, so you know what to expect.
Understanding permissions and what add-ons can access
When you install an add-on, it asks for permissions — a list of things it's allowed to see or do on your device. An ad blocker needs permission to see the content of every web page so it can find and hide ads. A password manager needs permission to see what you type in password fields. A weather extension needs permission to know your location. These are reasonable requests for those specific add-ons.
Be cautious if an add-on asks for permissions that don't match what it does. If a simple note-taking extension asks for permission to see your browsing history, that's a red flag — it has no reason to need that. If a calculator asks for permission to access your contacts, skip it. Stick to add-ons from known makers, and if you're unsure, search the add-on's name plus "permissions" or "privacy" to see what other people say about it.
You can change permissions after installation. In Chrome, go to Settings, then Extensions, find the add-on, and click Details to see and adjust what it can access. In Firefox, go to Add-ons, find the add-on, click the three dots, and choose Permissions. Removing a permission might break the add-on, but it's worth trying if you don't trust what it's asking for.
Turning add-ons off and on without removing them
Disabling an add-on is different from uninstalling it. When you disable an add-on, it stays on your device but stops running. This is useful when you want to test whether an add-on is causing a problem — like if your browser is running slowly or a website isn't loading right — without losing your settings if you decide to turn it back on.
In Chrome, go to Settings, click Extensions, and toggle the switch next to the add-on's name to turn it off. The switch turns gray when it's off. In Firefox, go to Add-ons, find the add-on, and click the toggle next to it. In Safari, go to Preferences, click Extensions, and uncheck the box next to the add-on's name. On your phone or tablet, most apps don't have add-ons, but some let you turn features on and off in their Settings.
If disabling an add-on fixes your problem, you've found the culprit. You can then decide whether to uninstall it, look for a different version, or contact the add-on maker to report the issue. If disabling it doesn't help, turn it back on and test the next one.
Removing add-ons you no longer need
Uninstalling an add-on is simple and takes seconds. In Chrome, go to Settings, click Extensions, find the add-on, and click the trash icon. In Firefox, go to Add-ons, find the add-on, click the three dots, and choose Remove. In Safari, go to Preferences, click Extensions, select the add-on, and click Uninstall. On desktop programs, look in the program's preferences or settings for an Add-ons or Plugins section, find the one you want to remove, and click Delete or Uninstall.
Removing an add-on doesn't hurt your device or the program it came from. The program continues to work normally. If you change your mind later, you can reinstall the add-on from the same store — your settings might be saved, depending on the add-on, but usually you'll start fresh.
It's a good idea to remove add-ons you don't use anymore. Each one uses a small amount of memory and processing power, and the fewer add-ons you have, the faster your device runs. Go through your add-on list every few months and delete anything you haven't opened in a while.
Staying safe with add-ons
The biggest risk with add-ons is installing one from an untrusted source. Malicious add-ons can steal passwords, track your browsing, inject ads, or slow your device to a crawl. To stay safe, only install add-ons from official stores — Chrome Web Store, Firefox Add-ons, Apple App Store, or the software maker's own website. Check the add-on's reviews and how many people have installed it; an add-on with thousands of installs and mostly positive reviews is safer than one with ten installs and vague descriptions.
Read the add-on's privacy policy if one is available. It should explain what data the add-on collects and what it does with it. If the policy is missing or says the add-on will sell your data, look for a different one. Be especially careful with add-ons that promise to do something too good to be true — like "earn money by browsing" or "watch videos and get paid." These often come with hidden costs or malware.
Keep your add-ons updated. When the add-on maker releases a new version, install it — updates often fix security holes. Most browsers update add-ons automatically, but desktop programs sometimes don't. Check your add-on list every month or so and update anything that shows a new version is available.
Frequently Asked Questions
Can I use the same add-on in different browsers?
No. An add-on built for Chrome won't work in Firefox, and vice versa. Each browser has its own add-on system. If you use multiple browsers, you'll need to install the add-on separately in each one. Some popular add-ons like uBlock Origin and LastPass are available for most major browsers, but you install them independently.
What should I do if an add-on stops working after a browser update?
First, check if the add-on maker has released a new version — go to the add-on's page in your browser's store and see if an update is available. If one is, install it. If not, disable the add-on and check the add-on maker's website or support page to see if they know about the problem. Sometimes add-ons break temporarily after a browser update, and the maker releases a fix within days.
Can add-ons slow down my browser or device?
Yes. Each add-on uses memory and processing power, especially if it's running in the background. If you have many add-ons installed, your browser may feel slower. Try disabling add-ons you don't use regularly, and uninstall ones you haven't opened in months. You'll notice a speed improvement if you cut your add-on count in half.
Is it safe to install add-ons on my phone?
Most phones don't support add-ons the way computers do. iPhone Safari and Android Chrome have limited add-on support compared to desktop browsers. Stick to official app stores — Apple App Store for iPhone and Google Play for Android — and avoid sideloading apps from unknown websites, which carries much higher risk.
What's the difference between an add-on and an app?
An add-on plugs into existing software and adds features to it. An app is standalone software that runs on its own. A browser extension is an add-on; a weather app is an app. Add-ons are usually smaller, lighter, and designed to work with one specific program, while apps are independent and can do more.