Firefox Market Share Plummets as Chromium Dominates Desktop

Mozilla Knocked Out: Chromium Devours 75% of Desktop as Firefox Bleeds

Firefox has been losing users for years, and recent data confirms the decline is accelerating. In September 2024, Mozilla’s global browser share was 2.74%; by May 2026, it had fallen to 2.19%. On desktop, the drop is even steeper: from 6.56% to 3.79% in the same period. Meanwhile, Chrome scales up to 75%. The trend is undeniable.

The Hemorrhage Numbers

Month-by-month figures draw a straight downward line. In August 2024, global Firefox was at 2.74%; September, 2.72%; October, 2.65%; November, 2.59%. On desktop, the sequence was August 6.65%, September 6.56%, October 6.39%, November 6.44%. The slight recovery in November was an illusion. By May 2026, the desktop figure plummets to 3.79%. Meanwhile, Chrome jumps from 66.33% in November 2024 to 75.05% in May 2026. The gap widens at a rate of three percentage points annually.

Performance and Compatibility: The Technical Burden

Firefox’s performance complaints are constant. Chromium’s JavaScript engine is faster, and Firefox’s RAM consumption is higher under equal conditions. On machines with modest specs (1 GB RAM, 2 GHz CPU), Chromium browses more smoothly. Users report pages loading poorly, choppy translations, and tabs freezing after recent updates (version 140 onwards). Compatibility also falters: many sites are optimized for Chrome, repeating the Embrace-Extend-Extinguish pattern Microsoft used with Internet Explorer. Firefox is playing catch-up.

Controversial Management: Between Rebranding and Terms of Use

Mozilla is losing not just on technology. Internal management has drawn criticism. In 2020, the organization fired 250 employees, and Google’s funding (which pays for being the default search engine) is under scrutiny. CEO Mitchell Baker has earned salaries up to $7 million, clashing with cuts and market share loss. In 2025, Mozilla renewed its logo and updated its terms of use, sparking controversy by including clauses granting broad rights over user data. The community interpreted this as a shift toward aggressive monetization, far from the project’s original spirit.

The Chromium Monopoly and Firefox’s Last Advantage

All mainstream browsers (Chrome, Edge, Opera, Brave) are Chromium-based, except Firefox and Safari. This creates a de facto monopoly that worries open-web advocates. Firefox’s only technical advantage is full support for uBlock Origin, while Chromium’s Lite version has restrictions. Ad blockers like uBlock Origin work at 100% only on Firefox. It’s a strong argument for privacy-conscious users, but insufficient to stop the bleeding: most prefer Chromium’s fluidity.

Alternatives and Uncertain Future

Edge, Chromium-based with Microsoft’s improvements, has become the preferred option on Windows, surpassing even Chrome in some optimization metrics. Brave offers built-in blocking and a podcast mode on YouTube. Safari remains strong in the Apple ecosystem. Firefox is left with a niche of loyalists, but its future depends on Mozilla reorienting its priorities: dropping parallel projects (Rust, Pocket) and focusing on performance, compatibility, and user trust. Without a radical change, data points to continued share reduction until irrelevance.

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With Chromium’s moat widening, the question is not whether Firefox will survive, but for how long it can claim to remain a relevant player. For now, the trend is devastating.

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