Best Promo Code Extensions for Chrome, Edge, Brave and Opera
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Google Chrome is the most popular browser in the UK, but it is far from the only one. Microsoft Edge comes pre-installed on Windows computers, Brave attracts privacy-minded users, and Opera has a loyal following thanks to its built-in features. If you use one of these browsers, you may wonder whether the money-saving extensions everyone recommends for Chrome will work for you too.
The good news is that Edge, Brave and Opera are all built on Chromium, the same open-source foundation as Chrome. That means most Chrome extensions, including promo code finders, can be installed and used in these browsers as well. In this guide we look at the best promo code extensions that work across Chromium browsers and explain how to install them wherever you browse.
What "Chromium-based" means for you
Chromium is the engine underneath Chrome. Microsoft, Brave Software and Opera each take that engine and add their own features, design and settings. Because the core is shared, extensions written for Chrome generally behave the same way in these browsers.
In practice, this gives you freedom. You can choose the browser you like best for speed, privacy or features, and still use the same shopping tools. If you ever switch browsers, your favourite extensions can come with you.
1. Couponio – best cross-browser promo code extension
Our first recommendation is Couponio, a promo code extension that runs on any Chromium browser, including Chrome, Edge, Brave and Opera.
Couponio's job is to make checkout cheaper without effort. On the basket or checkout page of a supported store, it pulls the codes it knows for that retailer, tries them one by one, compares the resulting totals and keeps the lowest price. If no code delivers a saving, it says so clearly, so you never have to wonder whether a failed code is still sitting in the field.
The quality of the codes is what makes it reliable. Couponio checks offers with an AI system and then tests them manually every day. The UK site lists around 1,850 stores with thousands of coupons and deals, and the developer reports that the extension covers more than 30,000 stores across the UK, US, Canada and Australia. It also suggests deals while you browse a shop, which helps you see what is on offer before you even reach the basket.
For users of privacy-focused browsers like Brave, Couponio's stance will be reassuring: it states that it does not collect payment details and does not sell user data. You can pause the extension on individual websites from the toolbar whenever you like. As a newer extension, it has fewer reviews than older competitors, but its cross-browser support and daily-tested codes make it our top pick.
2. Honey
Honey is available for Chrome and can also be used in other Chromium browsers. It automatically tests codes at checkout and provides Droplist price alerts. It works best on large international retailers. Since late 2024, it has been criticised over affiliate practices, so you may want to compare it with alternatives first.
3. Coupert
Coupert supports Chromium browsers and combines automatic coupon testing with cashback. It is a sensible choice if you want both features in one place and do not mind waiting for cashback to be confirmed by retailers.
4. Cashback reminders
Browser add-ons from UK cashback sites like TopCashback and Quidco can generally be installed in Chromium browsers too. They notify you when cashback is available, making them good companions to a promo code extension.
How to install Chrome extensions in each browser
Google Chrome
Open the Chrome Web Store, search for the extension, click "Add to Chrome" and confirm. Pin it to your toolbar using the puzzle-piece icon so you can see when it is active.
Microsoft Edge
Edge has its own add-ons store, but it can also install extensions from the Chrome Web Store. Go to Edge's extensions settings and enable the option to allow extensions from other stores. Then visit the Chrome Web Store, find the extension and click "Add to Chrome", which will install it in Edge.
Brave
Brave supports the Chrome Web Store directly. Visit the store, find the extension and click "Add to Brave" or "Add to Chrome". Brave's built-in shields block many trackers and ads; if a shopping extension behaves unexpectedly, you can adjust shields for that specific site.
Opera
Opera has its own add-ons catalogue, but you can install Chrome extensions by first adding Opera's official tool for installing Chrome Web Store extensions. Once that is in place, visit the Chrome Web Store and add the extension as normal.
Tips for using promo code extensions across browsers
Install the extension in the browser you shop in most. There is no need to install it everywhere if you only shop in one browser.
Use one coupon tester per browser. Running multiple code-testing extensions in the same browser can cause conflicts at checkout.
Check privacy settings. Strict tracker blocking in Brave or Edge can occasionally interfere with how extensions detect checkout pages. If an extension seems inactive on a store, try relaxing protection for that site only.
Keep browsers updated. Extensions are designed for current versions of Chromium. An outdated browser may cause problems.
Sync carefully. Some browsers sync extensions across devices. Make sure you are happy for your shopping tools to appear on every computer you sign in to.
Which browser is best for online shopping?
There is no single right answer. Chrome offers the widest compatibility. Edge integrates well with Windows and includes some of its own shopping features. Brave provides strong privacy protection by default. Opera offers a built-in VPN and other extras. Because all four are Chromium-based, the most important factor for saving money is not the browser itself but the extensions you add to it.
Troubleshooting common problems
If a promo code extension does not seem to work in your browser, a few quick checks usually solve the problem:
Is the extension enabled? Open the extensions page and confirm it is switched on. Some browsers disable newly installed extensions from other stores until you approve them.
Has it been paused on this site? Many coupon tools, including Couponio, let you pause them on individual websites. Check the toolbar icon to make sure it is active.
Are other shopping tools interfering? Temporarily disable other coupon extensions and try again.
Is the store supported? Extensions only activate on retailers in their database. If a shop is not supported, nothing will appear at checkout.
Have you reached the right page? Testing usually starts at the basket or checkout, not on product pages.
Conclusion
Whether you browse with Chrome, Edge, Brave or Opera, you can use the same powerful promo code extensions to save money online. Couponio is our top recommendation thanks to its daily-tested codes, automatic comparison of totals, clear results and support for every major Chromium browser. Add a cashback reminder if you use cashback sites, keep only one coupon tester active, and your preferred browser becomes a money-saving tool.
Switching browsers no longer means giving up your favourite shopping tools.