![]() Now, it's important to bear in mind that a lot of this work is on-going - the currently Nightly build (version 10) seems to actually have a slightly larger JavaScript memory footprint than the release build of Firefox (version 7) - but when all of these changes eventually land (probably in time for Firefox 11 - about four months away), and if you factor in other changes currently being made to Firefox's memory consumption, Firefox's RAM footprint could be a third of what it is now. JaegerMonkey, as of Firefox 10 or 11, will be the sole just-in-time (JIT) compiler. ![]() No one will miss it, RAM usage will be lowered, and Firefox itself will be a smaller download. ![]() Last but not least, TraceMonkey - JaegerMonkey's ancestor and in the words of Mozillan Nicholas Nethercote "a big hairball" - is being retired. Mozilla is currently looking into whether scripts can be "lazily loaded," too - as much as 70-80% of all downloaded JavaScript is never executed, and so it makes no sense to load it into memory lazy loading, where scripts are loaded as-needed, would significantly reduce memory usage. Slots arrays will have the option of being 32-bit, rather than being forcibly being constructed of 64-bit "fatvals." Shapes, one of SpiderMonkey's most important data structures, are going to be almost halved in size. JSObject is being cut in half, and thus JSFunction will also be slimmed down. Basically, almost every fundamental part of SpiderMonkey (Opens in a new window) is being torn apart, turned over in the hands of Mozilla's finest engineers, and rejigged to use less memory. If you're not a programmer, you should probably skip this paragraph. We want to make sure that we design defaults that suit most users and we’ll be retiring compact mode for this reason”.Firefox's single largest consumer of RAM, its JavaScript engine SpiderMonkey, is going on the mother of all diets. At any one time, SpiderMonkey's memory footprint can be over 50% of Firefox's total usage - the JavaScript on the ExtremeTech homepage, for example, uses no less than 115MB of memory - and slipstreaming SpiderMonkey is by far the best change that Mozilla can make to keep Firefox on the desktop svelte and competitive with Chrome and IE, and Firefox on Android less sluggish. The “compact” density is a feature of the “customize toolbar” view which currently fairly hard to discover, and we assume gets low engagement. “With the Proton redesign (or refresh of Firefox UI), we have to make difficult scope decisions to ensure Firefox remains simple to use and simple to maintain. The company believes the compact option in Customize window is tough to discover and hence assumes low usage. Mozilla wants to keep Firefox simple to use and maintain. Why is Mozilla retiring the compact mode from Firefox Choose from thousands of themes to give Firefox the look you want. If you select the Touch option, UI gets bigger to use on touch devices. When you set density to compact, Firefox user interface height will be reduced. What is the compact mode?īeginning with Firefox version 55, Firefox offers three different density options in the customize menu: But, Firefox no longer offers that density option after the upgrade, here is how you can enable it if you want. In the text box that appears below, enter the address of the website you’d like to use as your home page. In the drop-down menu beside Homepage And New Windows, select Custom URLs. After the backlash from users, the organization decided to keep it for current users. In the Options or Preferences tab, click Home and look for the New Windows And Tabs section. With the Firefox UI refresh, the company has removed the compact mode option from the customize palette. Mozilla released Firefox 89 on June 01, 2021, with Proton UI.
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