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  5. GM_lock JS (Library) - A lightweight, dependency-free mutex for Userscripts that ensures **only one tab / context** runs a critical section at a time. It coordinates through `GM.setValue` + `GM_addValueChangeListener`, so it works across multiple tabs, iframes, and even separate scripts that share the same @name/@namespace storage.

    Skaber
    𝖒𝖸 π–₯π—Žπ—‡π—€
    Oprettet
    01.11.2025
    Opdateret
    10.11.2025