Side-by-side comparison · AI Browsers & Agents
Firefox vs Manus vs Comet
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: People who want to hand off whole tasks and don't want to build the automation themselves.
Pick it if: Anyone who researches, compares or reads a lot online and wants an AI helper in the browser without paying for it.
Comet scores highest overall, but Firefox gives you more for your money. Which one is right comes down to what you value most.
Overview
| Attribute | Firefox | Manus | Comet |
|---|---|---|---|
| In one line | Mozilla's free browser with optional AI you can switch off with one setting. | A general-purpose agent that takes a goal and works through it in its own browser. | Perplexity's free web browser with an assistant that reads your tabs and does tasks. |
| Pricing model | Free | Freemium | Freemium |
| Starting price | Free | From $20/mo | $5/mo |
| Free plan | Yes | Yes | Yes |
| Works with Claude Code | No | Yes | No |
Rating breakdown
Our scores out of 5. The higher bar in each row is highlighted.
| Attribute | Firefox | Manus | Comet |
|---|---|---|---|
| Overall rating | 3.6 | 3.7 | 3.9Winner |
| 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 | 4.0 | 4.0 |
| 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 | 3.0 | 4.0 |
| Speed & reliabilityHow fast it is and how often it falls over. | 3.5 | 3.5 | 3.5 |
Feature comparison
A tick means it does this today. A dash means we haven't checked.
| Attribute | Firefox | Manus | Comet |
|---|---|---|---|
| Access & platform | |||
| Free plan | Yes | Yes | Yes |
| Mobile app | Yes | Yes | Yes |
| Desktop app | Yes | Yes | Yes |
| Browser extension | No | Yes | Yes |
| API access | No | Yes | No |
| Teams & business | |||
| Team workspace | No | Yes | Yes |
| Enterprise plan or SSO | Yes | Yes | Yes |
| 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 | No |
| Makes video | No | Yes | No |
| Writes code | No | Yes | No |
| Runs agents or automations | No | Yes | Yes |
| Learns your brand or style | No | No | No |
| Works in many languages | Yes | Yes | Yes |
| Capabilities score | 6/ 17 | 15/ 17 | 11/ 17 |
Pricing
Plans as listed on each vendor's site when we last checked. Confirm before you buy.
| Attribute | Firefox | Manus | Comet |
|---|---|---|---|
| Plans | FirefoxOur pick Free Everyone, with AI on or off as you choose. | Free Free Quick questions and seeing what it can do. | FreeOur pick Free Everyday browsing with an assistant for summaries and questions. |
Smart Window beta Free Heavy researchers in the US, Canada or France. | ProOur pick From $20/mo, less with yearly billing Anyone who wants to hand off real research and build jobs. | Comet Plus $5/mo Readers who want partner publishers' paywalled articles. | |
Pro (higher tier) From $40/mo, less with yearly billing Heavier users and anyone publishing websites with it. | Perplexity Pro $20/mo, or $200/yr Anyone who wants the agent to do tasks for them. | ||
Team From $20/seat/mo Teams that want shared credits and admin controls. | Perplexity Max $200/mo, or $2,000/yr Heavy users running many tasks in the background. | ||
Enterprise Custom Large organisations. | |||
| 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. | Try the Free plan for a week to get a feel for how many credits a real task uses, then move to the $20 Pro tier. Only go higher if you run out most months or you want it to publish websites for you. | Use it free: the sidebar assistant alone is worth having, and most people never need more. Pro makes sense if you want Perplexity's research tools anyway, but don't buy it just for the browser agent, since Pro's credits are a one-off bundle. Nobody needs Max just for the browser. |
Key features
| Attribute | Firefox | Manus | Comet |
|---|---|---|---|
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Pros and cons
| Attribute | Firefox | Manus | Comet |
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Who each one is for
| Attribute | Firefox | Manus | Comet |
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Questions people ask
Which is better, Firefox, Manus or Comet?
Comet scores highest overall in our ratings (Firefox 3.6/5, Manus 3.7/5 and Comet 3.9/5). Firefox is best for Keeping AI out of the browser entirely and using your own ChatGPT or Claude in a sidebar. Manus is best for multi-step research with a report at the end and lead lists and data gathering. Comet is best for summarising long pages, PDFs and videos and comparing products or suppliers across tabs.
Which is cheaper, Firefox, Manus or Comet?
Firefox: It's free and open source. Manus: There's a free plan, and paid plans start at From $20/mo. Comet: There's a free plan, and paid plans start at $5/mo.
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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