: Drag the Firefox icon into your Applications folder.
While Firefox 78 ESR will successfully run on OS X 10.10.5, you must understand the limitations of operating legacy software:
Because Firefox 78 ESR reached its final security cycle in October 2021, you must alter the default browser engine properties to maintain functionality and preserve resources on older hardware. Terminate Automated Update Loops firefox download for mac 10105 upd
To ensure you have the latest version of Firefox, follow these steps:
To get the correct version, you must access Mozilla’s archives. Follow these steps to ensure you are downloading from a legitimate source: : Drag the Firefox icon into your Applications folder
Because old systems lack modern root certificates, you will frequently encounter SEC_ERROR_UNKNOWN_ISSUER blocks on secure websites.
Once the .dmg file finishes downloading, complete the local setup using the standard macOS installation process: Follow these steps to ensure you are downloading
By default, Firefox is configured to download and install updates automatically in the background. When an update is available, Firefox will silently download the necessary files and prompt you to restart the browser to complete the installation. This ensures that you are always protected by the latest security fixes.