With the latest Firefox Nightly build, Mozilla is testing what it calls "Copy Link to Highlight," which allows you to create links to a specific string of text on a webpage by highlighting it. The feature works exactly the same way as it does in Google's Chromium. After highlighting text, there is an option in the context menu to copy a link to the highlighted text, which produces a link with the same "#:~:text=" tag that Chromium browsers have had for years. Of course, this being Firefox, there is also an option to copy a clean link to the highlight, which will strip unwanted things like trackers and affiliate links from the highlight link. When opening a link with the text highlight tag, browsers will direct you to the highlighted text—helpful for those times when you want to share a snippet of a website without taking a screenshot.

The highlighted text link is available in Firefox Nightly build 185, which is available on Linux, macOS, and Windows. There is no indication if this feature will make it to the Android version of the browser, and the feature is currently being held in Nightly for testing until the development team can be certain it's stable. Mozilla is also testing an API to enable Firefox extensions to detect if the recently added vertical tabs feature is enabled or not. This should enable extension developers to inform users if their extension is incompatible with vertical tabs and adjust the extension UI if need be. There are also a number of bug fixes in the nightly build as well, including fixes for the built-in unit converter and a bunch of minor UI fixes to features like the New Tab page and certain search features. Read the full release notes here for more details.