(Linux news in original post)
FOSS NEWS
Firefox 142 released with support for a flexible exception list in the Enhanced Tracking Protection (ETP) Strict mode split into baseline (core functionality) and convenience (extra features), support for removing extensions from the sidebar via the right-click menu, various fixes:
https://9to5linux.com/firefox-142-web-browser-is-now-available-for-download-heres-whats-new
Floorp 12.0 released with floating Panel Sidebar, expanded add-on compatibility, native mouse gestures, cross-window synchronization for workspaces, new Floorp Hub for all browser-specific settings, etc.:
https://alternativeto.net/news/2025/8/floorp-browser-12-0-adds-floating-panel-sidebar-and-native-mouse-gestures/
Servo monthly report: APNG and animated WebP support, support for width and height attributes of source tag, Vello backends for faster 2D graphics, etc.:
https://www.phoronix.com/news/Servo-July-2025-Highlights
Thunderbird 142 released with support for adding visual signatures to PDF attachments, support for resetting custom folder sorting in the folder pane, folder copy support within mail server accounts and local folders, ‘Copy Message Link’ and ‘Copy News Link’ options added to the header pane’s ‘More actions’, ‘Copy Message Location’ option removed from the mail context menu, etc.:
https://9to5linux.com/thunderbird-142-brings-support-for-adding-visual-signatures-to-pdf-attachments
More details about Thunderbird Pro: 500GB storage, Thundermail will have IMAP, SMTP and JMAP support, option to choose from @thundermail.com, @tb.pro or custom domains, Appointment will be integrated into Thunderbird, will feature multiple meeting types, Send will be built on the existing Filelink feature, will offer end-to-end encrypted file sharing:
https://betanews.com/2025/08/20/thunderbird-pro-is-moving-closer-to-launch-with-new-productivity-tools-thundermail-appointment-and-send/
Betterbird 140 released with multi-line view, enhanced search, improved system tray integration:
https://alternativeto.net/news/2025/8/betterbird-140-multi-line-view-enhanced-search-and-improved-system-tray-integration/
(more FOSS news in comments)