This release is not too flashy. Not much new was added, as we mostly focused on bug fixing. Having that said, some of those fixes are rather big. Overall, new version will be more stable and smooth.
Chromium
[Fixed] CSP change is not applied to iframes #440
[Fixed] "Allow search ads and websites' self-promotion" option doesn't work in Chromium extension #471
Firefox
[Added] Non-AMO version of Firefox extension with JS support #388
Addons.mozilla.org (AMO) has strict rules when it comes to uploading extensions that can work with JavaScript. That's why part of the filtering rules which were available for Chrome extension, Windows version etc. are not working in Firefox extension. This is why we make another version of FF extension available - without any limitations. You have to download it from GitHub though, as it will not be added to AMO.
[Fixed] Web-sockets are not blocked on some websites in Firefox and Edge #416
[Fixed] Issues on Firefox add-on update #380
[Fixed] Adguard can't be installed on Firefox Nightly 53.0a1 #443
[Fixed] Firefox with Adguard consumes lots of Memory #449
[Fixed] Frame scripts aren't executed properly on browser's first run #446
Safari
[Fixed] Invalid rule has blocked access to all websites #406
[Fixed] Safari extension does not fully support $generichide rules #437
[Fixed] Content Blocker css-display-none rules aren't applied when you open a website for the first time #153
Common
[Added] $important modifier #402
This new modifier is mostly for custom filtering rules enthusiasts and filter developers. In a word, this modifier allows to give certain rules higher priority over other rules, resulting in better filtering in some cases.
[Fixed] Content Security Policy excessive blocking #385
[Fixed] Some symbols are displayed in a different font #387
[Fixed] Bug in set[Restricted|Permitted]Domains method #391
[Fixed] Filter rule text box is now editable #331
[Fixed] Rule constructor ignores element id #445
[Fixed] Amazon page blinking issue #400
[Fixed] Ad blocking on forum.adguard.com can't be disabled #448
[Fixed] Changed the way url/referrer for frames is checked #444
[Fixed] Big frames (like youtube frames) do not pre-collapse any more #467
[Fixed] tvcast.naver.com issue #408
[Fixed] igrul-ka.ru issue #373
[Improved] "ExtendedCss" module upgraded to v1.0.6 #410
[Improved] A token/shortcut extracted from simple regex rules #332
[Improved] New filters server is used instead of AG backend #415
[Improved] Adguard styles are protected from removing #320
[Improved] "elementCollapser" is extracted to a separate file #366