Side-by-side comparison · AI Browsers & Agents
Firefox vs Microsoft Edge vs Opera One
Everything that matters when choosing between them, in one place: our rating, what each can do, what they cost, and the trade-offs.
Comparing 3 tools, the maximum.
At a glance
Pick it if: Business owners who want a trusted, independent browser and want to decide for themselves whether AI is on or off.
Pick it if: Windows and Microsoft 365 users who want AI help with reading, comparing and researching in the browser they already have.
Pick it if: Anyone who wants a free Chrome alternative with a capable AI sidebar, tab organisation and a built-in VPN, without paying for anything.
Overview
| Attribute | Firefox | Microsoft Edge | Opera One |
|---|---|---|---|
| In one line | Mozilla's free browser with optional AI you can switch off with one setting. | Microsoft's free browser with Copilot built in to read pages, compare tabs and do tasks. | Opera's free everyday browser with a built-in AI sidebar that reads your tabs. |
| Pricing model | Free | Freemium | Free |
| Starting price | Free | $19.99/mo | Free |
| Free plan | Yes | Yes | Yes |
| Works with Claude Code | No | No | No |
Rating breakdown
Our scores out of 5. The higher bar in each row is highlighted.
| Attribute | Firefox | Microsoft Edge | Opera One |
|---|---|---|---|
| Overall rating | 3.6 | 3.9 | 3.9 |
| Ease of useHow quickly someone non-technical gets value from it. | 3.5 | 4.5 | 4.5 |
| FeaturesHow completely it covers its own job, and how well the pieces fit together. | 3.0 | 3.5 | 3.0 |
| Output qualityHow good the results are before you fix them. | 3.5 | 3.5 | 3.5 |
| Value for moneyWhat you get for the price, including the free plan. | 4.5 | 4.0 | 4.5 |
| Speed & reliabilityHow fast it is and how often it falls over. | 3.5 | 4.0 | 4.0 |
Feature comparison
A tick means it does this today. A dash means we haven't checked.
| Attribute | Firefox | Microsoft Edge | Opera One |
|---|---|---|---|
| Access & platform | |||
| Free plan | Yes | Yes | Yes |
| Mobile app | Yes | Yes | Yes |
| Desktop app | Yes | Yes | Yes |
| Browser extension | No | Yes | No |
| API access | No | No | No |
| Teams & business | |||
| Team workspace | No | Yes | No |
| Enterprise plan or SSO | Yes | Yes | No |
| Connects to other apps | Yes | Yes | Yes |
| Open source or self-hosted | No | No | No |
| AI abilities | |||
| Works with your files | No | Yes | Yes |
| Understands images | No | Yes | Yes |
| Makes images | No | Yes | Yes |
| Makes video | No | No | No |
| Writes code | No | No | No |
| Runs agents or automations | No | Yes | No |
| Learns your brand or style | No | No | No |
| Works in many languages | Yes | Yes | Yes |
| Capabilities score | 6/ 17 | 12/ 17 | 8/ 17 |
Pricing
Plans as listed on each vendor's site when we last checked. Confirm before you buy.
| Attribute | Firefox | Microsoft Edge | Opera One |
|---|---|---|---|
| Plans | FirefoxOur pick Free Everyone, with AI on or off as you choose. | FreeOur pick Free Most people: summaries, tab comparisons and Journeys. | Free Free Everyone. There is no paid tier for the AI. |
Smart Window beta Free Heavy researchers in the US, Canada or France. | Microsoft 365 Premium $19.99/mo, or $199.99/yr US households and sole traders who want the agent and Office apps in one bill. | Free with an Opera accountOur pick Free Anyone who wants chat history across devices and more images. | |
Microsoft 365 Copilot (business) See website Companies on Microsoft 365 business plans. | |||
| Which plan to pick | There's nothing to pay. Use the sidebar with whatever AI account you already have. If you're in the US, Canada or France, try Smart Window with a free Mozilla account. Everyone else can join the waitlist. | Stay on free. The side panel, tab comparisons and Journeys cover what most business owners need, and they cost nothing. Microsoft 365 Premium is only worth it if you're in the US and already want Office for the household; don't buy it just for the browser agent, which Microsoft still calls experimental. | It's all free. Sign in with a free Opera account if you want your chats saved and more images; otherwise just download it and click Ask AI. Opera sells a separate VPN Pro, but you don't need it for the AI. |
Key features
| Attribute | Firefox | Microsoft Edge | Opera One |
|---|---|---|---|
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Pros and cons
| Attribute | Firefox | Microsoft Edge | Opera One |
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Who each one is for
| Attribute | Firefox | Microsoft Edge | Opera One |
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Questions people ask
Which is better, Firefox, Microsoft Edge or Opera One?
They tie on our overall rating (Firefox 3.6/5, Microsoft Edge 3.9/5 and Opera One 3.9/5). Firefox is best for Keeping AI out of the browser entirely and using your own ChatGPT or Claude in a sidebar. Microsoft Edge is best for summarising long pages and PDFs and comparing products or quotes across open tabs. Opera One is best for summarising long pages and YouTube videos and comparing suppliers or products grouped in a Tab Island.
Which is cheaper, Firefox, Microsoft Edge or Opera One?
Firefox: It's free and open source. Microsoft Edge: There's a free plan, and paid plans start at $19.99/mo. Opera One: It's free to use.
How we compare
Ratings are our own, from using each tool, across ease of use, features, output quality, value for money, speed & reliability.
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