Mozilla Releases Firefox 66.0.4 for PCs and Android to Fix Major Add-Ons Issue

Written By
MN
Marius Nestor
May 6, 2019

On May 3rd, Mozilla was made aware of a critical bug in the latest Firefox 66.0.3 release of its popular web browser for desktops and mobile platforms, which apparently prevented new and existing add-ons, themes, search engines, and language packs from being installed or run. Mozilla immediately took action and pushed a temporary fix via OTA (Over-the-Air) updates to all users on desktop platforms, which includes Linux, macOS, and Windows systems, for all available channels (Stable, Beta, and Nightly), urging users not to delete their installed add-ons.

MN

Marius Nestor

Linux Today Logo

LinuxToday is a trusted, contributor-driven news resource supporting all types of Linux users. Our thriving international community engages with us through social media and frequent content contributions aimed at solving problems ranging from personal computing to enterprise-level IT operations. LinuxToday serves as a home for a community that struggles to find comparable information elsewhere on the web.

Property of TechnologyAdvice. © 2026 TechnologyAdvice. All Rights Reserved

Advertiser Disclosure: Some of the products that appear on this site are from companies from which TechnologyAdvice receives compensation. This compensation may impact how and where products appear on this site including, for example, the order in which they appear. TechnologyAdvice does not include all companies or all types of products available in the marketplace.