ВольтикFirefox Download For Mac 10105 Upd
Published: May 2026
Reading Time: 6 minutes
If you’ve searched for “firefox download for mac 10105 upd” , you are likely running an older Mac – specifically one capped at macOS 10.10.5 (Yosemite) or a similar legacy build (e.g., 10.11, 10.12). The “upd” in your query suggests you need the latest possible update for that environment.
Apple no longer supports OS X Yosemite, but Mozilla has historically provided extended support releases (ESR) for older Macs. This article will walk you through exactly how to find, download, install, and troubleshoot Firefox for Mac OS X 10.10.5, ensuring you get the final secure update available.
Solution: Right-click (Ctrl+click) the Firefox app → Open → Click Open in the dialog. Or run in Terminal:
sudo spctl --master-disable
(Re-enable after install: sudo spctl --master-enable)
Since this is an older build, macOS might block it due to an expired gatekeeper ticket. If you see the warning “Firefox can’t be opened because it was not downloaded from the App Store”:
Look for the folder named 78.15.0esr (the final 78 ESR). If you want the absolute last version for 10.10.5, choose:
78.15.0esr/mac/en-US/
(Change en-US to your language, e.g., de, fr, ja). firefox download for mac 10105 upd
Before installing the legacy version, open your Applications folder. If you see a greyed-out Firefox icon with a "no entry" sign, drag it to Trash. Also empty your Trash to avoid permission conflicts.
Summary
Important note
Download & install steps
Security and compatibility tips
If you want, I can draft a short webpage blurb, email, or step-by-step checklist tailored for end users or IT staff.
For users running macOS 10.10.5 (Yosemite), the latest and final compatible version of Firefox is Firefox 78.15.0esr. Summary of Support Published: May 2026 Reading Time: 6 minutes If
Modern versions of Firefox no longer support macOS 10.10. Support for this operating system officially ended on October 5, 2021.
Final Version: Firefox 78.15.0esr (Extended Support Release).
Current Status: This version no longer receives security updates from Mozilla. How to Download
Since the standard Firefox Download Page will typically offer the newest version (which requires macOS 10.15 or later), you must manually download the legacy installer.
Official Mozilla Archive: You can find older versions via the Mozilla Support Forum or directly from the Mozilla FTP Archive.
Third-Party Repositories: Sites like Uptodown and MacUpdate maintain archives of older .dmg files if the official archive is difficult to navigate. Recommendations for Older Macs
Running an outdated browser on an unsupported OS poses security risks. To use the latest version of Firefox: Disable automatic updates immediately:
Check for OS Updates: See if your Mac can be updated to at least macOS 10.15 (Catalina) or higher.
Use Safari for Downloads: If your current browser is struggling to load modern HTTPS websites, use the native Apple Safari to download the Firefox installer.
Alternative Browsers: If Firefox 78 does not meet your needs, some users on legacy macOS versions look toward community-maintained browsers like Pale Moon or SeaMonkey, though compatibility varies.
It looks like you’re trying to find a Firefox download for Mac OS X 10.10.5 (Yosemite).
However, the latest versions of Firefox no longer support OS X 10.10.5. Mozilla ended support for 10.10, 10.11, and 10.12 after Firefox 78 (ESR) and Firefox 79+.
Here’s what you can do:
Or download from Mozilla’s official “Firefox for older Macs” page:
Note: Using Firefox 78 ESR means no new features, and security updates ended in 2021. For better security, consider updating macOS (if your Mac supports it) or switching to a lightweight browser like Pale Moon or Arctic Fox (community-maintained for older macOS).
If you meant macOS 10.15 (Catalina) instead of 10.10.5, let me know and I’ll give you the latest compatible Firefox link.