* Fixed the “Waiting for Extension Adblock Plus…” problem which some users were experiencing (https://issues.adblockplus.org/ticket/7065).
* Added the new @hide-if-contains-image@ snippet (https://issues.adblockplus.org/ticket/7088).
* Added the new @hide-if-has-and-matches-style@ snippet (https://issues.adblockplus.org/ticket/7137).

* Added the new abort-on-property-read snippet.
* Fixed a bug where an issue reporter screenshot was submitted without annotations under certain circumstances.

* Redesigned the first-run page.
* Redesigned the icon popup.
* Polished the design of the issue reporter and begun including a screenshot with each report.
* Made the following improvements to the settings page.
* Snippet filters are now required to be restricted to at least one domain.
* Started logging snippet filter hits in our developer tools panel.
* Removed support for legacy :-abp-properties() syntax.
* Special comments are now required to be given at the top of filter lists.
* Added the EasyList Portuguese filter list.
* Added the new dir-string snippet to simulate logging in the developer tools console.
* Reduced the initial memory footprint by ~16%, base memory usage by ~28%, and memory used per frame by ~660 KB.
* Fixed: Layout shifted after opening dialog for adding new filter list on the settings page.
* Fixed: Blank values for snippet arguments were ignored.
* Fixed: Sometimes all subscriptions were listed as additional subscriptions.
* Fixed: $rewrite filters using wildcards didn’t match end of URL.
* Fixed: $csp filters with blank value caused errors due to injection of an invalid header.
* Fixed: Element hiding emulation filters for the domain localhost were considered invalid.
* Fixed: Snippet filters were ignored if the user resubscribed to the ABP anti-circumvention filter list.
* Reverted to using inline styles for element hiding emulation filters.
* Ported the hide-if-contains-and-matches-style snippet.

* Added regular expression support to the "hide-if-contains" and "hide-if-shadow-contains" snippets.
* Added support to the "hide-if-contains" snippet for hiding a different ancestor of the element containing the search string.
* Fixed source archives.

* Added the new ABP anti-circumvention filter list.
* Added basic support for snippets.
* The $rewrite filter option now accepts a blank value.
* Trailing dots in domain names are now always ignored.
* Element hiding emulation now correctly qualifies compound selectors in the document’s style sheet.
* The :-abp-properties() pseudo-class now responds correctly to dynamic DOM updates.
* The $elemhide whitelisting filter option now works for documents with an unknown parent frame.
* Reduced the initial memory footprint by ~8%.
* Further improved the performance of element hiding emulation.
* Fixed the rendering of SVG icons on the options page for mobile.

* Added the $csp filter option (issue 5241).
* Requests sent by Shared/Service Workers are now matched in the context of the document that caused the worker to spawn, i.e. requests sent from the worker are now also subject to document-based whitelisting and domain-specific filters (issue 6543).
* Users with corrupted storage are now notified and instructed to reinstall Adblock Plus (issue 6599).
* Fixed: Videos (and other media elements) remained hidden if they previously attempt to stream a blocked resource (e.g. a pre-roll ad) but then changed their URL (issue 5899).
* Fixed: Exception rules for element hiding emulation filters were considered invalid when adding custom filters (issue 6139).
* Improved performance of element hiding emulation filters (issue 6437).
* Added support for pre-configurable preferences (issue 6474).
* Prevented third-party style sheets from breaking element hiding emulation filters (issue 6382).
* Worked around the limitations of notifications on Firefox (issue 6496).

* Improved "element hiding emulation filters":/development-builds/new-syntax-for-advanced-element-hiding-rules.
** Fixed false positives and related memory leak in dynamically changing documents (https://issues.adblockplus.org/ticket/5864).
** Added regular expression support for @:-abp-contains()@ (https://issues.adblockplus.org/ticket/6034).
** Added support for relative prefix within @:-abp-has()@ (https://issues.adblockplus.org/ticket/6296).
* Fixed empty error message when adding invalid custom filter (https://issues.adblockplus.org/ticket/6417).
* Removed the social media buttons from the ABP icon menu (https://issues.adblockplus.org/ticket/5613).
* Fixed a bug causing pages to be rendered blank when Web Components are enabled (https://issues.adblockplus.org/ticket/6441).
* Fixed the “Block element” dialog on Firefox 51 (https://issues.adblockplus.org/ticket/6113).
* Fixed links in the mobile Settings page, seen on Android (https://issues.adblockplus.org/ticket/6199).
* Fixed: Message about whitelisted domain is shown repeatedly on the Settings page (https://issues.adblockplus.org/ticket/6420).
* Improved performance when adding large number of custom filters (https://issues.adblockplus.org/ticket/6440).