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Read more below:Mozilla plans to support lazy loading for images and iframes in Firefox 75. Lazy loading refers to a technique that defers the loading of elements on a page to improve loading and rendering of the webpage, reduce memory use and network data usage; these elements are usually below the fold on load (not visible to the user).
Lazy loading up until now required the use of JavaScript. A new attribute for images and iframes adds lazy loading support in browsers that support it. Google introduced support for the new lazy loading tag in Chrome 76 which it released last year.
Mozilla added support for lazy loading in recent versions of Firefox Nightly, the cutting edge development version of the browser. Lazy loading is not enabled by default but users may enable it in Firefox Nightly. The feature will make its way to Beta, Dev and eventually Stable versions of the Firefox web browser.
Firefox 75 gets lazy loading support for images and iframes - gHacks Tech News
Mozilla plans to support lazy loading for images and iframes in Firefox 75 to reduce memory usage and speed up page loads.
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