User-selectable search suggestions in the "Awesome Bar". API Changes: Preparation for SHA-256 signing certificates. Alternatives for Older Macs (2026 Updated)
Enhanced private browsing, allowing users to choose to block additional trackers. API Improvements: Better m4v video playback support.
Because this is an old application, you may need to bypass macOS Gatekeeper by right-clicking the app and selecting "Open," or allowing it in System Preferences > Security & Privacy . Key Features of Firefox 43.0.1 firefox 43.0 1 download for mac
Finding a secure and functional web browser for an older Mac can be challenging. While modern browsers have moved on, you may need to to support legacy extensions, specific web applications, or to run on older operating systems such as OS X 10.6 to 10.10.
Using a browser from 2015 in 2026 presents . Version 43.0.1 contains known vulnerabilities that put your personal data at risk. It is highly recommended to use the latest supported version of Firefox, or Firefox ESR (Extended Support Release), if your macOS allows it. Where to Safely Download Firefox 43.0.1 for Mac User-selectable search suggestions in the "Awesome Bar"
To avoid malware, only download legacy software from trusted sources.
If Firefox 43.0.1 is too outdated for the websites you need to visit, consider these alternatives for legacy Mac hardware: Firefox 43.0.1, See All New Features, Updates and Fixes API Improvements: Better m4v video playback support
A reputable source that scans older software for safety. Filename: Firefox 43.0.1.dmg (approx. 79 MB) How to Install on Older macOS Download the Firefox 43.0.1.dmg file from the link above. Open the downloaded file. Drag the Firefox icon into your Applications folder.