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Mozilla last week released Firefox 58 for Windows, macOS and Linux, building on the break-from-the-past Quantum edition of November by boosting page load speeds with changes to how the browser handles JavaScript.
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, click the help icon - the question mark within a circle -- after pulling up the menu under the three horizontal bars at the upper right. Choose "About Firefox." The ensuing page shows that the browser is either up to date or details the updating process.