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Mozilla on Tuesday released Firefox 59 for Windows, macOS and Linux, continuing the trend of pushing performance improvements begun late last year.
Firefox, which can be downloaded from here, updates in the background, so most users need only relaunch the browser to get the latest version. To manually update, pull up the menu under the three horizontal bars at the upper right, then click the help icon (the question mark within a circle). Choose "About Firefox." The resulting page shows that the browser is either up to date or details the updating process.