WebKitGTK 2.25.3 released!

This is a development release leading toward 2.26 series.

Remove support for GTK2 NPAPI plugins.
Fix web view updates after swapping web process if accelerated compositing mode is forced.
Make kinetic scrolling work again.
Fix position of emoji chooser when page is scrolled.
Fix web process deadlock when scrolling twitter timeline which contains HLS videos.
Make navigation gesture use dark fallback background color color on dark themes.
Make Previous/Next gesture work in RTL mode.
Support cancelling touchscreen back/forward gesture.
Add user agent quirk to make github work in FreeBSD.
Fix content disappearing when using CSS transforms.
Fix some radio streams that could not be played.
Fix video pause that sometimes caused to skip to finish.
Fix volume level changes when playing a video.
Fix several crashes and rendering issues.

Thanks to all the contributors who made possible this release.