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Comparison

Firefox vs Vivaldi

Compare the facts. Check the scope. Choose what fits.

Documented differences
0
Same documented value
3
Need more evidence
19
Mozilla Corporation
Firefox
36% Research progress
Vivaldi Technologies
Vivaldi
42% Research progress
Change products Explore the evidence Share card (SVG) API

At a glance

Differences, not an overall ranking

The comparable values we have documented are the same. Open research gaps before drawing a conclusion.

Explore the evidence

Open a row for sources and plan limits
Which criteria should be shown?

No differences are documented on both sides yet. Check the research gaps or select All.

Security and compliance

Audit log
Not yet verified on either side A gap in our research, never a no.
Data processing agreement offered
Not yet verified on either side A gap in our research, never a no.
EU data residency stated
Not yet verified on either side A gap in our research, never a no.
FedRAMP authorisation
Not yet verified on either side A gap in our research, never a no.
GDPR compliance stated
Not yet verified on either side A gap in our research, never a no.
HIPAA compliance stated
Not yet verified on either side A gap in our research, never a no.
ISO/IEC 27001
Not yet verified on either side A gap in our research, never a no.
CVE records in NVD
3,337
Firefox
Verified90% confidence NVD had matched 3337 CVE records to the CPE name cpe:2.3:a:mozilla:firefox on 2026-09-06; a count of records across all years, not a measure of risk
Not researched
Vivaldi
Not yet verified
Needs more evidence
Sources for this row
Firefox:

NVD had matched 3337 CVE records to the CPE name cpe:2.3:a:mozilla:firefox on 2026-09-06; a count of records across all years, not a measure of risk

National Vulnerability Database (Primary documentation), retrieved 2026-09-06
PCI DSS stated
Not yet verified on either side A gap in our research, never a no.
SOC 2 Type II
Not yet verified on either side A gap in our research, never a no.

Platform and integration

Public API
Not yet verified on either side A gap in our research, never a no.
Separate browser profiles
Not researched
Firefox
Not yet verified
Yes
Vivaldi
Verified71% confidence User Profiles keep browser setups separate within one installation. They are not a substitute for separate operating-system accounts.
Needs more evidence
Sources for this row
Vivaldi:

User Profiles keep browser setups separate within one installation. They are not a substitute for separate operating-system accounts.

Vivaldi Browser Features | Everything’s an option (Primary documentation), retrieved 2026-10-03
Browser data sync
Yes
Firefox
Verified71% confidence Sync uses a Mozilla account and covers bookmarks, history and saved passwords across supported devices.
Yes
Vivaldi
Verified71% confidence Vivaldi documents synchronising browser data across multiple devices. Confirm which data types are available on each platform.
Same value
Sources for this row
Firefox:

Sync uses a Mozilla account and covers bookmarks, history and saved passwords across supported devices.

Firefox browser sync — Firefox.com (Primary documentation), retrieved 2026-10-03
Vivaldi:

Vivaldi documents synchronising browser data across multiple devices. Confirm which data types are available on each platform.

Vivaldi Browser Features | Everything’s an option (Primary documentation), retrieved 2026-10-03
Data export
Not researched
Firefox
Not yet verified
Yes
Vivaldi
Verified71% confidence Vivaldi documents exporting bookmarks to HTML. This is not a promise that every browser setting or extension can be exported.
Needs more evidence
Sources for this row
Vivaldi:

Vivaldi documents exporting bookmarks to HTML. This is not a promise that every browser setting or extension can be exported.

Import and export browser data | Vivaldi Browser Help (Primary documentation), retrieved 2026-10-03
Mobile app (iOS or Android)
Yes
Firefox
Verified71% confidence Firefox documents sending tabs to Firefox on iPhone, iPad and Android devices.
Not yet verified
Vivaldi
Not yet verified
Needs more evidence
Sources for this row
Firefox:

Firefox documents sending tabs to Firefox on iPhone, iPad and Android devices.

Firefox browser sync — Firefox.com (Primary documentation), retrieved 2026-10-03
On-premises or self-hosted option
Not yet verified on either side A gap in our research, never a no.
SCIM user provisioning
Not yet verified on either side A gap in our research, never a no.
Split-screen tabs
Not researched
Firefox
Not yet verified
Yes
Vivaldi
Verified71% confidence Tab Tiling displays multiple pages side by side within the desktop browser.
Needs more evidence
Sources for this row
Vivaldi:

Tab Tiling displays multiple pages side by side within the desktop browser.

Vivaldi Browser Features | Everything’s an option (Primary documentation), retrieved 2026-10-03
Single sign-on
Not yet verified on either side A gap in our research, never a no.
Tab groups
Yes
Firefox
Verified71% confidence The feature page documents grouping tabs by project or task. Check availability on each device.
Yes
Vivaldi
Verified71% confidence Desktop Tab Stacking organises tabs into two-level groups.
Same value
Sources for this row
Firefox:

The feature page documents grouping tabs by project or task. Check availability on each device.

Learn about Firefox features — Firefox.com (Primary documentation), retrieved 2026-10-03
Vivaldi:

Desktop Tab Stacking organises tabs into two-level groups.

Vivaldi Browser Features | Everything’s an option (Primary documentation), retrieved 2026-10-03
Built-in tracking protection
Yes
Firefox
Verified71% confidence Firefox documents automatic tracker blocking. This confirms a feature, not a comparative privacy or security test.
Yes
Vivaldi
Verified71% confidence Vivaldi documents a built-in Tracker Blocker. Presence of a blocker is not a measurement of its effectiveness.
Same value
Sources for this row
Firefox:

Firefox documents automatic tracker blocking. This confirms a feature, not a comparative privacy or security test.

Learn about Firefox features — Firefox.com (Primary documentation), retrieved 2026-10-03
Vivaldi:

Vivaldi documents a built-in Tracker Blocker. Presence of a blocker is not a measurement of its effectiveness.

Vivaldi Browser Features | Everything’s an option (Primary documentation), retrieved 2026-10-03
Uptime commitment (%)
Not yet verified on either side A gap in our research, never a no.
A missing measurement never counts against a product. If we could not reach a document, that is a fact about our research and not about the vendor. Open a row to see the source, its tier and the day we read it.