

Firefox no longer warns users that multiple tabs are open when the browser is closed (with one exception).It can be used to unload tabs manually to free up system resources. The page about:unloads is now available.Firefox macOS now uses Apple's low power mode for fullscreen video on YouTube and Twitch this is done to extend battery life.In particular, it lets users use a different server location for each of the existing containers. The latest version of Mozilla's Firefox Multi-Account Containers extension introduces support for Mozilla's VPN service. Firefox Multi-Account Containers extension with Mozilla VPN integration
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This new security architecture allows Firefox to completely separate code originating from different sites and, in turn, defend against malicious sites trying to access sensitive information from other sites you are visiting. Site Isolation builds upon a new security architecture that extends current protection mechanisms by separating (web) content and loading each site in its own operating system process. You can check out Mozilla's post here for additional details. Called Project Fission internally, site isolation aims to improve privacy and security significantly by isolation webpages and third-party iframes. Mozilla started to test Firefox's Site Isolation feature in Firefox 70, and r olled it out in Firefox Nightly in September 2020.

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