Shared components used by Firefox and other Mozilla software, including handling of Web content; Gecko, HTML, CSS, layout, DOM, scripts, images, networking, etc. Issues with web page layout probably go here, while Firefox user interface issues belong in the Firefox product. (More info)
![1293305 - Disable non-standard for-each on nightly-only](https://cdn-ak-scissors.b.st-hatena.com/image/square/94e68033a33a368f97324bf314b4b8b9099309f2/height=288;version=1;width=512/https%3A%2F%2Fbugzilla.mozilla.org%2Fextensions%2FOpenGraph%2Fweb%2Fmoz-social-bw-rgb-1200x1200.png)