v3.8.7 — Hotfix: About logo + Doppler Sapphire

Superseded by v3.8.8 — auto-open delay fix, Doppler map export/import, marketplace phase filter.

CS:Restored Inventory Helper v3.8.7

Hotfix — critical bugs after the v3.8.x big update (About logo + Doppler Sapphire).

Use v3.8.8 for the latest .zip / .xpi assets.

Requires Firefox 128+.

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Full changelog: docs/CHANGELOG.md