What version of Firefox do I have?
Detect your Firefox version from the browser user agent with quick manual steps to confirm.
Firefox not detected
Manual method
- Open Firefox menu (≡) → Help
- Click "About Firefox"
- Version will be shown in the dialog
Troubleshooting
- Some environments mask the user agent, which can prevent automatic detection.
- Use the manual steps above for the most accurate version.
What is this tool?
A simple Firefox version checker based on your user agent string.
If UA masking prevents detection, use Help → About Firefox to see the exact version.
Manual check
Follow these steps:
1.Open menu:
Click ≡ (hamburger) → Help.
2.About Firefox:
The version number appears in the dialog.
Why it matters
Typical reasons:
- CompatibilityEnsure websites and extensions support your version.
- SecurityStay current to receive Firefox security updates.
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