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Browser security architecture

Enterprise browser vs remote browser isolation.

An enterprise browser enforces policy inside the local browser. Remote browser isolation runs page code in a cloud browser. The device receives pixels, drawing instructions, or sanitized content.

Choose RBI when page code must not run locally. Choose an enterprise browser for in-session workforce controls. Several vendors now sell both models.

Test identity, data controls, and applications before choosing.

Written byLegbaReviewed 2026-10-30 · Updated 2026-10-30

The short version

Enterprise browser and RBI categories overlap increasingly. Vendor category pages promote their own architecture. Direct workflow evidence matters more.

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What is the difference between an enterprise browser and RBI?

Enterprise browsers place controls inside browsing sessions. The browser usually remains on endpoints. Policy follows user activity there.

Remote browser isolation moves active execution remotely. A cloud browser fetches pages. The endpoint receives rendered output or instructions.

Modern products blur this boundary. Zscaler offers several browser forms. Menlo combines cloud browsing and extension controls.

Island expanded beyond one dedicated browser. Prisma also documents a browser extension. Choose using required execution boundaries.

  • Enterprise browsers govern local sessions.
  • RBI moves active execution remotely.
  • Hybrid products combine control layers.
  • Browser form changes policy reach.
  • Applications still require direct testing.

SourcesPrisma Browser documentationThe Prisma Browser ExtensionIsland Enterprise BrowserFalcon Seraphic Enterprise BrowserCloudflare Browser IsolationWhat Is Zero Trust Browser?Menlo Remote Browser Isolation

Can one product be both an enterprise browser and RBI?

Dedicated enterprise browsers remain one model. Island presents this model directly. Prisma Browser also provides managed browser software.

Runtime modules create another model. CrowdStrike Falcon Seraphic works across chosen browsers. Its claims remain vendor-authored evidence.

Remote isolation remains a distinct execution model. Cloudflare, Zscaler, and Menlo document remote browser execution. Their delivery methods differ.

Several vendors now span categories. Zscaler sells cloud browser, extension, and enterprise browser forms. Menlo pairs cloud isolation with a secure extension. Product form and policy placement matter more than labels.

  • Dedicated browsers embed enterprise management.
  • Extensions preserve existing browser choices.
  • Runtime modules add session controls.
  • Cloud browsers move content execution.
  • Hybrid platforms blend these patterns.

SourcesIsland Enterprise BrowserIsland Enterprise Platform announcementPrisma Browser documentationThe Prisma Browser ExtensionFalcon Seraphic Enterprise BrowserWhat Is Zero Trust Browser?Menlo Secure Enterprise Browser

Where does page code run in each model?

Local enterprise browsers render active pages locally. Their embedded controls observe browser activity. Endpoint exposure depends on implemented protections.

Cloudflare isolation executes active content remotely. Network Vector Rendering returns drawing commands. The endpoint reconstructs page visuals.

Zscaler creates remote Chromium containers. Pixel streaming returns image output. Turbo Mode returns rendering instructions. Endpoints render those instructions natively.

Menlo describes remote cloud browsers too. Its Adaptive Clientless Rendering returns sanitized content. This differs from pixel streaming.

No transport guarantees every application. WebRTC, devices, files, media, and extensions can behave differently. Test important workflows.

  • Locate active JavaScript execution.
  • Locate file inspection boundaries.
  • Identify endpoint rendering work.
  • Identify remote session lifecycle.
  • Test sensitive browser capabilities.

SourcesCloudflare Browser IsolationCloudflare Browser Isolation limitationsWhat Is Zero Trust Browser?Understanding Turbo Mode for isolationUsing persistent state for isolationMenlo Remote Browser IsolationIsland Enterprise Browser

Use the execution ownership matrix.

The execution ownership matrix separates five commonly merged questions. It identifies execution, control, user change, state, and ownership. Each row needs evidence.

Treat every product as a specific implementation. Category names only provide starting hypotheses. Pilot results should replace those hypotheses.

Map architecture to operating ownership and proof.
FactorEnterprise browserRemote isolationRequired proof
Active page executionUsually remains within endpoint browsing software.Runs inside remote browser infrastructure.Trace code and file boundaries.
Primary policy pointBrowser session and user actions.Traffic policy and isolated session controls.Map each required control location.
Browser choiceDedicated or extension forms vary.Native browsers receive output or instructions.Document every supported user browser.
Session stateLocal profile behavior depends on product.Remote state may expire or persist.Test sign-in and state deletion.
Unmanaged usersManaged browser workspace may be installed.Clientless or extension paths may apply.Pilot contractor onboarding and removal.
AI agent coveragePrisma announced agent controls; Island supports agentic browsers.Menlo's hybrid extends policy to browser agents.Run one agent task through each model.
Operations ownerEndpoint and browser teams often participate.Network and access teams often participate.Assign one accountable service owner.
Failure evidenceCapture policy and browser failures.Capture transport and session failures.Use one common severity scale.

How do enterprise browsers and RBI handle AI agents?

Several browser security vendors now market AI agent controls. Palo Alto updated Prisma Browser on March 23, 2026. That update targets agentic AI. CrowdStrike lists agentic browsers among Falcon Seraphic's supported browsers.

Island's extension supports ChatGPT Atlas and Perplexity Comet. Menlo extends policies to browser agents in Chrome and Edge.

Each of these claims comes from vendor pages. Test agent workflows as a separate pilot cohort. Record which actions humans and agents take.

  • List agents that browse for employees.
  • Decide where agent page code may run.
  • Test data controls on agent actions.
  • Confirm logs separate humans and agents.

SourcesPrisma Browser agentic AI announcementFalcon Seraphic Enterprise BrowserIsland Enterprise BrowserMenlo Secure Enterprise Browser

Control scope differs substantially.

Enterprise browser products emphasize identity context. They also govern data actions. Copy, paste, upload, download, and capture can become policies.

RBI products emphasize remote execution. Many also expose data controls. Zscaler profiles include file, clipboard, print, and watermark settings.

Menlo now presents combined cloud browsing. Its secure extension adds local visibility and controls. That combination creates another hybrid model.

Similar control names can mislead. Enforcement points differ across architectures. Test both allowed and denied workflows.

  • Map identity signals by cohort.
  • Map data actions by application.
  • Locate each enforcement point.
  • Review audit data ownership.
  • Test exception handling paths.

SourcesManage Prisma Browser access and data rulesIsland Enterprise BrowserCreating isolation profilesMenlo Secure Enterprise Browser

State and experience need testing.

Local browser profiles can preserve familiar state. Exact behavior depends on enterprise configuration. Browser replacement can still change user habits.

Zscaler documents temporary remote containers. Default idle expiration is 10 minutes. Optional persistent state can restore browser information.

Zscaler stores persistent state encrypted. State unrestored for 15 days is purged. A 100 MB limit applies.

Zscaler's figures are volatile product limits. Recheck them before procurement. Other vendors may document different behavior.

Remote rendering also changes interaction paths. Zscaler offers native and browser-in-browser experiences. Turbo Mode adds native endpoint rendering. Application testing remains mandatory.

  • Test authentication persistence requirements.
  • Test idle session recovery.
  • Test multiple windows and tabs.
  • Test accessibility and input methods.
  • Reverify every published limit.

SourcesWhat Is Zero Trust Browser?Understanding Turbo Mode for isolationUsing persistent state for isolationCreating isolation profilesCloudflare Browser Isolation limitations

Which vendors sell each model?

The vendor map covers products compared on this site. It records documented product forms only. It does not rank the vendors.

Hybrid vendors appear in more than one model. Zscaler and Menlo sell remote and local forms.

Map each vendor to its model and code location.
FactorModelWhere page code runsDelivery or control point
IslandEnterprise browser and extensionOn the user's deviceIn-browser policy controls
Prisma BrowserEnterprise browser and extensionOn the user's devicePalo Alto policy rules
Falcon SeraphicRuntime security in existing browsersOn the user's deviceRuntime session controls
CloudflareRemote browser isolationCloudflare remote browserNetwork Vector Rendering
ZscalerCloud browser, extension, enterprise browserCloud or device, by formPixels or Turbo Mode instructions
MenloRemote isolation plus secure extensionMenlo Cloud, with local extension controlsAdaptive Clientless Rendering

Treat vendor comparisons carefully.

Menlo criticizes pixel-streaming isolation publicly. Menlo promotes its own rendering method. That remains vendor positioning.

Enterprise browser vendors often criticize remote latency. RBI vendors often criticize endpoint exposure. Neither argument proves universal outcomes.

Request reproducible pilot evidence. Reject unlabeled benchmark charts. Keep network conditions and applications identical.

  • Label vendor comparisons explicitly.
  • Separate architecture from performance claims.
  • Reject unmatched test conditions.
  • Record undisclosed methodology gaps.
  • Prefer repeatable local evidence.

SourcesMenlo Remote Browser IsolationCloudflare Browser Isolation limitations

Build the proof around boundaries.

Begin with content execution requirements. Then map enterprise controls. Choose representative devices and applications.

Create a managed employee cohort. Create an unmanaged contractor cohort. Include administrators and high-risk workflows.

Record deployment effort separately. Record browsing failures separately. Record policy authoring and support work.

Test rollback before purchase. Exit difficulty can outweigh licensing. Evidence should include complete cleanup.

  1. 01

    Declare boundaries

    State where active content may execute. State required endpoint controls.

  2. 02

    Select cohorts

    Include managed and unmanaged users. Include important operating systems.

  3. 03

    Exercise workflows

    Test identity, data, files, media, and private applications. Record every failure.

  4. 04

    Measure ownership

    Track endpoint, network, identity, and support effort. Name unresolved dependencies.

  5. 05

    Prove rollback

    Remove policies and endpoint components. Confirm state deletion where required.

SourcesPrisma Browser documentationIsland Enterprise BrowserCloudflare Browser IsolationWhat Is Zero Trust Browser?Menlo Remote Browser Isolation

Legba is not an enterprise browser or RBI platform.

Legba's Shield mode is remote isolation for individuals. It runs a page in a browser off your device. Ghost changes the route your browser uses. Neither mode is an enterprise browser.

Legba documents no workforce policy console. It documents no enterprise DLP or fleet management. Downloads and copied data cross the Shield boundary.

Use enterprise platforms for governed fleets. Consider Legba for personal browsing of untrusted pages.

  • Enterprise browsers govern workforce sessions.
  • RBI platforms manage remote infrastructure.
  • Shield isolates selected pages for one person.
  • Ghost changes the route; pages still run locally.

SourcesLegba product overviewIsland Enterprise BrowserWhat Is Zero Trust Browser?

FAQs.

What separates enterprise browsers from RBI?
Enterprise browsers govern browser sessions. RBI moves active page execution remotely.
Can one platform provide both models?
Yes, several platforms now blend forms. Verify each documented enforcement boundary.
Is RBI better than an enterprise browser?
Neither is better everywhere. RBI keeps page code off devices. Enterprise browsers control actions inside the session.
Does RBI always use pixel streaming?
No, delivery methods differ. Cloudflare uses drawing commands. Menlo returns sanitized content. Zscaler also documents Turbo Mode instructions.
Which architecture performs better?
Public documentation cannot answer universally. Test your applications and network conditions.
Do enterprise browsers secure AI agents?
Some vendors now claim agent controls. Palo Alto announced them for Prisma Browser. Test agent workflows before relying on them.
Which model suits unmanaged contractors?
Both categories offer relevant options. Compare installation, identity, data, and removal requirements.
Is Legba an enterprise browser platform?
No, Legba's extension serves individual browsing. Shield isolates pages for one person.

References

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