Mozilla Firefox 139 Brings Custom New Tab Wallpapers

The new Mozilla Firefox 139 release is rolling out from today and, compared to recent releases of late, it’s far lighter on user-facing changes. Not that every release can, of course. We have been spoiled: Firefox 136 came with vertical tabs, Firefox 137 brought tab grouping and revamped address bar, while last month’s Firefox 138 release debuted a proper profile manager/switcher. By comparison, the headline change in Firefox 139, per its release notes, is full-page translations on extension pages (but only if they start with the moz-extension:// URL scheme). Mozilla say this delivers a “popular request” from users. Elsewhere, Firefox 139
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https://www.omgubuntu.co.uk/2025/05/mozilla-firefox-139-released-new-features