Assertion: browser's feature | /r/HasProperty | introduced in recent versions of firefox
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text: The support for older style extensions may be dropped eventually, but for now the lead developer of Waterfox plans to maintain the current version of the browser (which is based on Firefox 56), and will soon release a version of Waterfox based on Firefox 68 ESR; the latter will require legacy extensions to be ported, but will add additional features introduced in more recent versions of Firefox.