$ 0 0 Closed as fixed: Firefox NoScript + uMatrix = cookie leak TabContext.onGC has bad scalability on FF Default placeholder background takes too long to display (FF ESR 38, Linux) SeaMonkey Custom rules reset after each browser restart Core CSP rule breaks site unless 1st party scripts are allowed No number in icon Downloads uMatrix.chromium.zip uMatrix.firefox.xpi Source: https://github.com/gorhill/uMatrix/releases