SeaMonkey
The all-in-one internet suite.
The direct descendant of Netscape Communicator: browser, mail client, newsgroup reader, and HTML editor in one application, still quietly maintained.
- Engine
- Gecko (legacy)
- License
- Open source
- Runs on
- Windows, Linux, macOS
- Top marks
- Built-in tools, Classic interface, Open source, Independence
- Updated
- September 2026
Why it shines
- Browser + email + composer in one
- Netscape heritage, classic UI
- Light on resources
Worth knowing
- Based on an older Gecko — some sites struggle
- Slow release cycle
Origins
SeaMonkey belongs to The Mozilla family — descended from Mozilla.
Does well
Scorecard
- Tracking protection0/3
- Fingerprinting resistance0/3
- Anonymity0/3
- Built-in ad blocking0/3
- Customization0/3
- Keyboard control0/3
- Built-in tools3/3
- Minimal interface0/3
- Fresh design0/3
- Classic interface3/3
- Light on resources2/3
- Raw speed0/3
- Battery efficiency0/3
- Extension ecosystem1/3
- Cross-device sync0/3
- Site compatibility1/3
- Low maintenance1/3
- Open source3/3
- Independence3/3
- Built-in AI0/3
- Gaming features0/3
- Dev tooling0/3
0–3 on each of the 22 criteria the quiz and the guides rank by. How we score.
