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Jake WriterandClaude Opus 5.5
676fb3f7c1
anti-font-fingerprinting.patch added a seeded amount to every glyph advance, so that text widths differed per context. No real machine produces those widths: the same font on the same OS measures the same everywhere. So the noise was itself a fingerprint, measured in #779 at +1 px per ~100 glyphs plus fractional deltas on every measureText. #779 defaulted the seed to 0 and kept it as an opt-in, but an opt-in whose only effect is to become detectable is not worth carrying. Removed: - The browser side: - FontSpacingSeedManager and window.setFontSpacingSeed; - the HarfBuzz hook; - the plumbing that existed only to carry the context id down to the shaper: the userContextId on gfxTextRun, gfxShapedWord and the word-cache key, and the extra MakeTextRun argument in nsTextFrame, nsFontMetrics, MathML and canvas. The font group keeps its userContextId, which font-list-spoofing.patch uses to apply the per-context font list. Text is now shaped exactly as stock Firefox shapes it. - The fonts:spacing_seed key. The launcher had been sending 0 on every launch, plus a setFontSpacingSeed(0) call in every context's init script. - tests/patches/config-overrides.py, which tested only the spacing override. A pythonlib test now covers config_overrides with another key. timezone-spoofing, webrtc-ip-spoofing and window-setter-seal change only in context lines and the setter seal list. Every patch applies cleanly to a fresh tree, and the result builds. The settled decision is recorded as no-glyph-spacing-noise, with an automated check. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>