Mozilla sustainability score: 48/100
Leading practice starts at 60. The highest score on SINK is 71.
Head office USStaff ~750Revenue ~$680MWebsite ↗
Mozilla scores 48/100 (Making progress) on SINK's independent climate assessment, scored from public data only. Scores are free. Nobody can pay to change a score, speed it up or hide it. Last verified September 2026.
That places Mozilla joint 211th of 1,023 companies scored, and 20th of 69 in SaaS / Digital Services.
What is Mozilla doing well, and where does it fall short?
Strongest on Controversies & Red Flags and Carbon Footprint: Operations (8/10, 6/10). Weakest on Emissions Trajectory and Targets & Commitments (2/10, 2/10).
Where Mozilla lost points
For each question that lost points, the evidence our public rubric looks for that we didn't find.
What would raise this score
- Whether its emissions are fallingShow its emissions are falling.
- Its climate targetsSet specific targets with dates.
- Its effect on natureAssess its effect on nature and publish a basic environmental policy.
Every question that lost points
- Emissions from its own operations6/10Its own emissions aren't independently verified or tracked over several years.
- Emissions from its supply chain6/10No full value-chain map or supplier engagement programme.
- Whether its emissions are falling2/10No evidence its emissions are falling.
- How clean its energy is4/10Less than half its energy shown to be renewable, or no transition plan.
- Its effect on nature3/10No assessment of its effect on nature, and no basic environmental policy.
- How it uses materials and handles waste3/10No active waste reduction, reuse or repair shown.
- Its effect on water3/10No monitoring of water use, or no measures to reduce it.
- Its climate targets2/10No specific targets with dates.
- How openly it reports5/10No dedicated sustainability role, board oversight or public report.
A score changes when the evidence does. We use new published evidence at the next rescore. Anyone can send us new evidence, free. How to send it.
How is Mozilla's SINK score calculated?
Same ten questions for every company. No private weighting.
SINK = (0.3 × Base + 0.7 × Performance) × ScaleWhat evidence is Mozilla's score based on?
12 sources used in this assessment. All publicly available. Each row shows which of the ten questions it informed.
“Mozilla partnered with POINT380 to conduct our 2019 GHG inventory and with Watershed to conduct our 2020-2023 GHG inventories”
“we purchased renewable energy certificates (RECs) for our offices and co-locations in North America, Europe and Taiwan”
“Mozilla partnered with EcoAct to invest in three projects, including Madre de Dios REDD project, Peru; Darkwoods carbon forestry project, Canada; and Rimba Raya Reserve project, Indonesia”
“From water rights disputes between data centres to rampant greenwashing misinformation by fossil fuel companies”
“Revenue $37.2M (2024), Expenses $41.2M (2024), Total Assets $123M (2024)”
“Mozilla Corporation has been involved in a range of controversies [relating to privacy and business model, not environment]”
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How does Mozilla compare with other saas / digital services companies?
Where Mozilla sits among saas / digital services peers.
Among the 69 major saas / digital services brands we've scored, Mozilla sits 20th of 69.
Who scores higher in SaaS / Digital Services?
The 3 companies in the sector scoring nearest above Mozilla.
Snap reports comprehensive Scope 1 and 2 emissions data verified via GHG Protocol, but absolute Scope 3 emissions have ballooned 92% since 2019 while relying on intensity-based targets to mask the growth.
See the breakdown →Salesforce claims net-zero ambitions while quietly downgrading absolute Scope 3 targets to intensity metrics—a weakening move that undermines credibility.
See the breakdown →DuckDuckGo's environmental footprint is negligible by design—fully distributed, no owned infrastructure, minimal operational emissions under 1,000 tCO₂e annually.
See the breakdown →Which companies moved this week, and why.
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