What is a browser extension? A simple guide to installing and using them
Extensions are small add-ons that give your browser new powers — from blocking ads to translating pages. Here's what they are, how to install them safely, and the ones worth knowing.
The BOSLA AI team4 min read
Your browser can already open any website. Extensions let it do more: block annoying ads, fill in your passwords, translate a page in one click, or switch every site to dark mode.
This guide explains what extensions are, how to install one in the browser you already use, what people use them for, and how to stay safe while you do it.
What is a browser extension?
A browser extension (also called an add-on or plugin) is a small program you add to your browser to give it a new feature. Think of the browser as your phone and extensions as the apps you choose to install on it.
Once installed, an extension usually appears as a small icon next to the address bar. Some work quietly in the background (like an ad blocker); others open a small panel when you click their icon (like a translator or a note-taking tool).
Extensions can:
- Change how pages look — dark mode, bigger text, hiding distractions.
- Add tools — translation, grammar checking, screenshots, saving articles for later.
- Protect you — blocking trackers and ads, managing strong passwords.
- Connect your apps — save a page to your notes or a task to your to-do list without leaving the page.
How to install an extension
The safest way is always the official store for your browser. The steps are almost the same everywhere:
Google Chrome
- Open the Chrome Web Store (chromewebstore.google.com).
- Search for the extension and open its page.
- Click Add to Chrome, read the permissions it asks for, then click Add extension.
- Click the puzzle-piece icon next to the address bar and pin the extension so its icon is always visible.
Microsoft Edge
- Open Edge Add-ons (microsoftedge.microsoft.com/addons) and click Get on the extension you want.
- Edge can also install extensions from the Chrome Web Store — it will ask you to Allow extensions from other stores the first time.
Mozilla Firefox
- Open Firefox Add-ons (addons.mozilla.org).
- Click Add to Firefox, review the permissions, then click Add.
Safari (Mac, iPhone and iPad)
- Safari extensions come from the App Store — search for the extension and install it like an app.
- Then turn it on in Safari's settings, under Extensions.
On phones: most mobile browsers don't support extensions. The main exceptions are Safari on iPhone and iPad, and Firefox on Android.
Managing and removing extensions
You can see everything you've installed, switch an extension off, or remove it completely:
- Chrome: type
chrome://extensionsin the address bar. - Edge:
edge://extensions - Firefox:
about:addons - Safari: Settings → Extensions.
What people use extensions for
- A calmer, cleaner web — block ads and pop-ups, hide recommendation feeds, read in a distraction-free view.
- Security and privacy — password managers, tracker blockers.
- Language — translate pages, check grammar and spelling as you write.
- Productivity — to-do lists, note clippers, tab managers, screenshot tools.
- Comfort — dark mode on every site, readable fonts, zoom and accessibility helpers.
- Shopping and research — price trackers, reference managers, dictionary look-ups.
Popular extensions worth knowing
These are well-known, widely used examples — check each one's store page for the browsers it supports:
- uBlock Origin (Firefox) / uBlock Origin Lite (Chrome, Edge) — blocks ads and trackers.
- Bitwarden — a free, open-source password manager that fills in your logins securely.
- Google Translate — translates a whole page or a selected sentence.
- Grammarly — checks spelling, grammar and tone while you type.
- Dark Reader — turns any website into dark mode.
- Notion Web Clipper — saves pages and articles straight into Notion.
- Todoist — adds tasks from any page to your to-do list.
Staying safe with extensions
Extensions can be very useful, but they can also see what you do on websites. A few simple habits keep you safe:
- Install only from official stores — never from a random download link.
- Read the permissions. "Read and change all your data on all websites" is normal for an ad blocker, but strange for a calculator.
- Check the publisher and reviews — popular extensions sometimes have fake copies with similar names.
- Keep fewer extensions. Remove the ones you don't use; every extension is code running in your browser.
- Keep your browser updated — updates bring extension security fixes too.
Where BOSLA AI fits in
BOSLA AI is being built as a browser extension too: a personal layer that helps you decide what deserves your attention online — so your feed follows your priorities, not the algorithm. It isn't released yet; create your free account and we'll let you know as soon as you can try it.
