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@marcolbx did you find a solution?
@AdrienRoussel did you find a soultion?
Anyone was able to get a proper solution? https://answers.unity.com/questions/1844559/webgl-not-releasing-memorywebgl-not-releasing-the.html
For me with version 2019.4.21f I deleted the folder : Library> PackageCache, It worked fine after that. Hope it will help someone.