Verified Confidence: high
Primary source found; it says the same thing, the scope matches, and it is reasonably current.
Safe rephrasing
Since 2022 Firefox has, by default, kept each site's cookies in a separate 'cookie jar', so trackers cannot follow users across sites.
What the source says
Total Cookie Protection works by creating a separate “cookie jar” for each website you visit.
Mozilla — Firefox rolls out Total Cookie Protection by default to more users worldwide
- Commonly cited as
- "Firefox blocks third-party cookies"
- True origin
- Mozilla — Firefox rolls out Total Cookie Protection by default to more users worldwide
- Type
- Reference fact: A frequently needed number or rule taken directly from a primary source (e.g. Pew, Census, IAB/PwC, FTC), with its as-of date.
- Year
- 2022 (updated Aug. 2024)
- Data as of
- Mozilla blog, June 14, 2022
- Last checked
- Method & sample
- Mozilla product announcement.
- Drift between quote and source
- Cookies are partitioned per site rather than blocked outright
- Interest
- Mozilla describing its own browser.