Premium
What's new in Firefox Klar: No Fuss Browser 4.2
From version 4.1:
- Improved user experience when other apps opening Focus as the default browser
- Provide additional information when browsing secure websites (lock icon in address bar)
- Bug fixes and stability improvements
About Firefox Klar: No Fuss Browser 4.2
Browse like no one’s watching. The new Firefox Klar automatically blocks a wide range of online trackers — from the moment you launch it to the second you leave it. Easily erase your history, passwords and cookies, so you won’t get followed by things like unwanted ads.
Premium
“Private browsing” on most browsers isn’t comprehensive or easy to use. Klar is next-level privacy that’s free, always on and always on your side — because it’s backed by Mozilla, the non-profit that fights for your rights on the Web.
AUTOMATIC PRIVACY
• Blocks a wide range of common Web trackers without any settings to set
• Easily erases your history — no passwords, no cookies, no trackers
BROWSE FASTER
• By removing trackers and ads, Web pages may require less data and load faster
MADE BY MOZILLA
• We believe everyone should have control over their lives online. That’s what we’ve been fighting for since 1998.
Download Firefox Klar: No Fuss Browser 4.2
This release may come in several variants. Consult our handy FAQ to see which download is right for you.
Version:8.4.0
Uploaded:June 25, 2020 at 9:37PM UTC
File size:53.84 MB
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File size:36.93 MB
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Version:149.0.1
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File size:36.92 MB
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Version:149.0
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Version:148.0.2
Uploaded:March 10, 2026 at 4:20PM UTC
File size:36.17 MB
Downloads:70
Version:148.0.1
Uploaded:March 3, 2026 at 2:04PM UTC
File size:36.17 MB
Downloads:66
Version:148.0
Uploaded:February 18, 2026 at 11:23AM UTC
File size:36.17 MB
Downloads:3
Version:147.0.4
Uploaded:February 16, 2026 at 2:36PM UTC
File size:35.96 MB
Downloads:58
Version:147.0.1
Uploaded:February 13, 2026 at 6:13PM UTC
File size:35.96 MB
Downloads:227
Version:147.0.3
Uploaded:February 5, 2026 at 3:44PM UTC
File size:35.96 MB
Downloads:86
Version:147.0.2
Uploaded:January 27, 2026 at 2:13PM UTC
File size:35.96 MB
Downloads:69
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