Jelmerro/Vieb 8.0.0 on GitHub

Setting "useragent" to use any number of custom useragents (either one, or a list that is randomly used per page load)
Settings "encodeurlcopy" and "encodeurlext" to control the percent encoding/decoding of the urls
Script-based blocking of ads in the adblocker, for example to block Youtube and Twitch ads
Support for "prompt" dialogs, and thus "show" and "notifyshow" are now valid values for "dialogprompt"
Mouse option named "movepointer" which moves the pointer to the click location
Actions "toggleSourceViewer" and "toggleSourceViewerNewTab" to toggle the new theme supported "sourceviewer"
Actions "toggleReaderView" and "toggleReaderViewNewTab" to toggle the new theme supported "readerview"
More default themes: numberedtabs and compact (thanks to @stevkazt)

Setting "windowtitle" now accepts a custom string with variables instead of hard-coded formats (linking to password managers should be easier now)
Dialog settings are now all blocked with notifications by default
Duplicate download numbering now starts from (1) instead of (2)
Duplicate download name for files that end in "tar.something" will now have the counter before the ".tar"
Iframes are now isolated properly, making them faster and more secure (no more infinite loop to set listeners for them)
Privacy overrides are now always done with a preload, making them faster and more secure (no more infinite loop to patch them)
Increase default timeoutlen above Vim's level because it makes more sense for Vieb
Rename "fontsize" to "guifontsize" to make it more clear where the font size applies
Url detection logic to be more in line with the actual spec, resulting in simpler implementation
Downloadpath is now empty by default and will read XDG_DOWNLOAD_DIR/xdg-user-dirs (with the same fallback to ~/Downloads as before)
Give "storenewvisits" new options for "sourceviewer" and "readerview", and rename "builtin" to "special" to make more sense

Action "toLastUsedTab" in favor of using ":buffer #" in line with other buffer-like commands that support "#"
Startup option to enable strict site isolation, it is now strictly isolated at all times
CSS transitions from default theme (specifically on the mode selector)

Command "reloadconfig" did actually reset the settings instead of just reload them
Urls prefixed with a protocol not being checked if they are navigable urls at all (possibly resulting in broken tabs if navigated to)
Race condition on unsuspending tabs and opening tabs with a url directly that led to empty pages
Composing keyboards typing out the keys in addition to the composed keys on macos
Internal errors for looping over pages when some of them are suspended (in case of zooming, page capturing, or save page)
Follow links (or their labels) not being visible if an element continues outside the visible section of the page

For more details see the CHANGELOG.
For startup help see the frequently asked questions.

Jelmerro/Vieb 8.0.0 Vieb 8.0.0 on GitHub