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Zen Browser 1.14.5b was a real release, published on July 14, 2025. Its release notes list two fixes: Compact Mode could turn off when windows were restored, and accessibility issues related to custom colors were addressed. It is now a historical, outdated version; most people should use a current release from Zen’s official download page instead.
What Zen Browser 1.14.5b is
Zen is a separate, open-source desktop browser built on Firefox technology. It emphasizes features such as Spaces, vertical tabs, split views, Compact Mode, and interface customization. It is not Mozilla Firefox, and Zen’s version numbers are not Firefox release numbers. You can find the project and its source code in the official Zen Browser repository.
In “1.14.5b,” 1.14 identifies the release line and .5 its fifth patch release in that line. Zen published this build with a beta-style “b” suffix; the suffix should not be read as a Firefox version designation.
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Zen’s official release history dates 1.14.5b to July 14, 2025. It followed 1.14.4b, dated July 10, and preceded 1.14.6b, dated July 25. That short interval places it among a sequence of maintenance releases, not a new product edition.
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What changed in 1.14.5b
Compact Mode and restored windows
The release notes say the update fixed a problem in which Compact Mode could turn off when Zen restored windows. In practical terms, the setting could fail to persist through window restoration. The note does not claim to fix every Compact Mode or session-restoration problem.
Accessibility and custom colors
Zen also said it corrected accessibility issues associated with custom colors. The release note does not identify the affected interface elements, platforms, assistive technologies, or contrast measurements. It is not evidence of full accessibility conformance or a fix for every custom theme.
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Those are the two changes listed for 1.14.5b; it was a small bug-fix release rather than a feature-heavy update. The surrounding release notes describe broader changes in 1.14b and 1.14.6b.
Which Firefox version did it use?
The official 1.14.5b release-note entry does not specify a Firefox engine version. A contemporaneous GitHub issue identifies one user’s installation as Zen Browser 1.14.5b with Firefox 140.0.4 (64-bit). That is an attributed report about that installation, not a complete official engine-version specification for every build.
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Is 1.14.5b still current or suitable for everyday browsing?
No. As of August 16, 2026, Zen’s official history includes later releases well beyond the 1.14 line. The 1.14.5b notes do not provide a detailed security bulletin, so they do not establish a count of later security fixes it lacks. But an old build necessarily misses subsequent browser maintenance, making it a poor choice for everyday or sensitive browsing. Prefer a current release unless you have a specific reason to reproduce the old environment.
How to check your version and update Zen
Check the installed version
- Open Zen Browser and its application menu.
- Choose Help, then About Zen.
- Read the version shown in the About dialog. Menu placement can vary by operating system or release; if needed, search the application menu for “About Zen.”
Install a current release
- Open About Zen and let the browser check for updates.
- Install an offered update and restart if prompted.
- If no update appears, check the official release history, then use the official download page or official GitHub releases.
Update detection has failed or lagged for some users: a Zen GitHub issue records a report from a 1.13.2b installation that said it was up to date while 1.14b was available. If you update manually, keep your existing profile unless you have a specific reason to create a clean one. Back up important data first, and test a new profile before deleting an old one if an update causes problems. Extensions, themes, and custom CSS may not behave identically across releases. For Linux installation and update guidance, see Zen’s official Linux guide.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Should you download the old version?
| Situation | Recommendation |
|---|---|
| Ordinary daily or sensitive browsing | Use a current official Zen release, not 1.14.5b. |
| Reproducing a July 2025 bug or matching an old support environment | Use 1.14.5b only when the exact historical build is necessary; an isolated test profile is prudent. |
| Checking whether the old installer is still available | Look at the official 1.14.5b release page. The release’s existence does not guarantee that every platform asset remains available. |
| Finding the build through a third-party mirror | Avoid unverified downloads. A SourceForge mirror listing exists, but its referenced installer was reported unavailable; it is not a recommended source. |
For historical testing, an archived browser should be treated as a test artifact, not a general browsing recommendation. If the official release page no longer offers the required asset, do not substitute an untrusted mirror.
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