While most Firefox users probably don't need the functionality, some may have used it for certain useful operations such as killing sticky elements on a page, changing the referrer on the fly or edit any website you come across temporarily.
The Firefox 63 changelog does not mention the change; considering that Mozilla makes hundreds of changes to Firefox, it is clear that it represents only a small portion of changes.
Thankfully, it is possible to undo the change by changing the value of a preference of the web browser. Here is how that is done:
You can undo the change at any time by repeating the three steps outlined above.
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Ghacks is a technology news blog that was founded in 2005 by Martin Brinkmann. It has since then become one of the most popular tech news sites on the Internet with five authors and regular contributions from freelance writers.