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What “brute force” means in this claim
Brute force is an offline guessing attack: someone with access to the relevant profile data uses software to test candidate passwords until one matches. That is different from a Firefox interface bug that skips a prompt, and different again from finding old password data that was not encrypted as expected.
Passcape Software’s 2022 recovery-software manual describes dictionary, brute-force, and mask-based recovery methods. It calls brute force “the slowest attack” and says it is “really great for short passwords.” That is a vendor’s description of its own recovery tools, not an independent security test or a measured estimate of how long a current Firefox Primary Password would take to recover. Read the Passcape manual.
What the documented Firefox issues actually involved
| Issue | What happened | Version and evidence |
|---|---|---|
| Saved-password copy prompt defect | A user who had already entered the Primary Password in the same session could copy a saved password from Saved Logins without being prompted again. | Mozilla’s CVE-2019-11733 advisory lists Firefox 68.0.2 and Firefox ESR 68.0.2 as fixed. It describes a same-session authorization defect, not brute-force cracking. Mozilla advisory. |
| Legacy profile data exposure | Older, unencrypted saved-password data could remain in a profile when passwords saved before Firefox 58 were copied into a new format after a Primary Password was set. | Mozilla’s CVE-2018-12383 advisory lists Firefox ESR 60.2.1 as fixed. The issue depended on legacy profile data; it was not brute force. Mozilla advisory. |
| Second-installation report | A Bugzilla report alleged that protected logins could be accessed through another Firefox installation. The report’s reproduction was contested, and the discussion involved an older Firefox installation and old profile data. | The report does not establish a universal bypass in current Firefox. Bugzilla discussion. |
| Offline password recovery | Recovery software can test password candidates against accessible profile data. | The reviewed vendor manual documents recovery methods but supplies no independent current crack-time benchmark. Passcape manual. |
Does this show that Firefox passwords are easy to crack?
No. The cited sources establish that recovery tooling exists and that some historical Firefox defects exposed password data or weakened a prompt in specific circumstances. They do not establish how quickly an attacker could recover a current Primary Password, how often such attempts succeed, or that the feature can generally be bypassed with ease.
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Those results depend on the actual threat model. A person who can open a browser after the Primary Password has already been entered in that session is not in the same position as someone who has only copied profile files and is attempting offline guesses. The historical advisories address their stated conditions; they do not supply a present-day brute-force work factor.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What Firefox calls the feature now
Mozilla’s current support terminology is “Primary Password”; “master password” is the older name. For Mozilla’s present feature explanation and user guidance, see Use a Primary Password to protect stored logins. The older advisories above remain useful for understanding their specific historical defects, but their fixed-version notes should not be treated as a description of every current release.
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What to do if you are concerned
- Use Mozilla’s current Primary Password guidance to review how the feature works and how it is enabled in your version of Firefox.
- Keep Firefox updated. The cited historical defects have specific fixed versions; they are not evidence that an unpatched version is safe or that a patched version is affected in the same way.
- If you are assessing a copied or old profile, treat access to the profile files as a separate local-access risk from a browser prompt defect. The legacy exposure described by Mozilla had a particular pre-Firefox-58 password-history condition.
- Choose a strong, unique Primary Password. The vendor manual identifies short passwords as a more suitable target for brute-force attempts, but the reviewed sources do not support a numerical recovery-time estimate.
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