Firefox:
Require unlimitedStorage permission (-> FF >= 56!)
Fix tab creation with parent ID at Android (Dashboard, GM_openInTab, ...)

Sync:
Fix cloud services authentication

Locales:
Update Russian and Ukrainian locale | thanks to bogachenko
Update Portuguese-Brazil locale | thanks to igorruckert
Update Italian locale | thanks to bovirus

General:
Allow multiple @webRequest tags
Sandbox fixes
Support SHA-256 subresource integrity hashes independently of the browser's crypto API
Better userstyles.org userscript support
Fix a memory leak when using GM_xmlhttpRequest which could lead to crashes
Allow repeated space at some script header tags (author, namespace, copyright)
Speed up @include regexps by optimizing .*.*
Compress zip archives again

UI:
Remember script storage export setting
Show menu commands below the userscript entry at the action menu
Don't show script updates if the user is active or a fullscreen window is present
Enable section save button on changes only

Locales:
Update Spanish locale | thanks to TBM13
Update Turkish locale | thanks to Tmp341
Update Russian locale | thanks to bogachenko
Update Indonesian locale | thanks to ReksaTresna
Add Dutch locale | thanks to The947thTokay
Update French locale | thanks to zek0faws
Update Indonesian locale | thanks to Azhe403
Update Chinese (traditional) locale | thanks to PeterDaveHello and cedarkuo
Update Japanese locale | thanks to shirayuki
Update Italian locale | thanks to bovirus
Update Spanish locale | thanks to rocammo
Update Hungarian locale | thanks to hubalazs

Sync:
Fix sync to TamperDAV
Improve WebDAV protocol compatibility for NextCloud support

Experimental:
GM_cookies support

General:
Fix script externals import issues
Fix import from zip files with folders
Use https for all links to tampermonkey.net
Fix GM_xhr.responseType 'document' support
Allow script editing via external editor by using TamperDAV
Reduce memory footprint (by doing less caching)
Add GitLab subgroup support
Add several .com.* 2nd level domains
Sync:
Increase WebDAV protocol compatibility
WebDAV based cross-browser sync (beta; tested with OwnCloud and TamperDAV)
UI:
Minor layout refresh
Fix blurry icons
Avoid action menu flicker on GM_registerMenuCommand usage
Update dark theme | thanks to narcolepticinsomniac
Add narcolepticinsomniac's dark theme matching editor layout
Make the script filter bar work if its visibility is enforced via Custom CSS

General:
Allow ESLint inline configuration again to make globals definition work
Import and export of external resources (@resource and @require)
Replace zip.js by JSZip
Fix an internal cache related problem which could have caused data-loss
UI:
Invert (and fix) meaning of the case-insensitivity search option
Further search bar improvements
Allow the editor button bar to be restored via Custom CSS
Set ESLint ECMAScript version according to the browser's capabilities
Locales:
Update Portuguese-Brazil locale | thanks to igorruckert
Update Japanese locale | thanks to ScratchBuild
Update Italian locale | thanks to bovirus
Update Chinese (simplified) locale | thanks to efreedev

General:
Switch from JSHint to ESLint 4.19.0
Clean GM_tabs data on tab close
Fix script externals update
Locales:
Add Croatian and Serbian locale | thanks to faultyfuse
Update Italian locale | thanks to bovirus
Add Hindi locale
Update Russian locale | thanks to Dr-Yukon
Update Turkish locale | thanks to ali-demirtas
Update Portuguese-Brazil locale | thanks to igorruckert
UI:
Lint in background for more editor responsiveness
Limit displayed script name length
Update CodeMirror to version 5.35
Rework editor search
Add action menu option to exclude a script from a domain
Remember scroll position on tab switch
Firefox:
Create a new beta channel
Make Instant Injection more reliable
Sync:
Dropbox based cross-browser sync (beta)

UI:
Add a lot of editor commands to the menu

General:
Add .co.th to .tld

Locales:
Update French locale | thanks to zek0faws

UI:
Fix script update setting saving
Fix display of SVG icons
Better @downloadURL none support
Minor script install page fix
Allow script source code to be searched as well
Editor menu
Fixes related to the modified script close icon
Fix script storage editor to not reset to its initial data on every tab selection

General:
Fix an issue which could break page scripts
Avoid update requests to Greasyfork scripts with a pinned version
Fix GM_notification click listener
Fix GM_download progress events
Fix GM_download.abort
Fix issues if GM_openInTab.name= or GM_openInTab.close was used at more than one tab

Locales:
Add Vietnamese | thanks to Connor37
Update Russian locale | thanks to BychekRU and irainman
Update Italian locale | thanks to bovirus
Update Norwegian locale | thanks to LarsSimonsen
Update Czech locale | thanks to engycz
Update Indonesian locale | thanks to DhannyNara
Update Arabic locale | thanks to Alayady
Update Russian locale | thanks to BychekRU

Simple script storage editor
Allow all browsers to use synchronization
Allow script update servers to signal unchanged content
Fix blank action menu issue
Make GM_download support all common details properties at FF >= 52
Experimental: Enable browser sync at FF >= 53
Add GitLab and Bitbucket support
Avoid some 'Unchecked lastError' warnings | thanks to tophf
Add Portuguese locale | thanks to Sara F.
Update Polish locale | thanks to hawkeye116477
Fix issues at some pages
Make sure all config is written before reloading
Fix issues at nightly builds
Add an option to add custom CSS to the Tampermonkey UI
Add an option to disable the update check on a script base
Allow scripts to run at XML pages | thanks to Thom1729 for the slight lead
Fix some sandbox functions (set/clearTimeout/Interval and add/removeEventListener) to properly handle unusual arguments

Use "stickering" to improve the icon visibility at dark themes
Log @require related errors at the page console
Fix some rare internal exceptions
Update Korean locale | thanks to KENNYSOFT
Fix CSP related issues
Add ZenBurn editor theme
Visual bookmark support

Add Korean locale | thanks to KENNYSOFT
Fix GM_notification
Enable webRequest support at Firefox 52+ to fix many GM_xhr related issues (finalUrl, cookies, ...)
Fix missing action menu icon at internal tabs
Make xhr response headers available at readyState 2 and higher
Add time and browser to backup names
Fix relative URL handling
Fix sync issues of script comment properties
Fix doubled include/exclude editor dialogs
Make * include file URIs as well
Update the ES6 script template

Speed up storage writing
Fix extension reload for version 51 and above
Improved script search/filtering at the dashboard

Allow backup and restore with cloud storages (Google Drive, Dropbox, OneDrive)
Update Chinese (traditional) locale | thanks to TobySkarting
Update Czech locale | thanks to d3jv
Remove autodetection of some compatibility options
Update JSHint to 2.9.2

Fix the sandbox on{event} properties
Fix the editor replace code and show which part of the script text is going to be replaced
Update Chinese (simplified) locale | thanks to lychichem
Update saveAs to 1.3.2
Firefox: fix GM_download
Firefox: fix drag and drop script positioning

Fix cancelation of GM_xhr requests (not completely working in fetch mode)
Use a fallback in case the page CSP wasn't relaxed (disabled setting or cached page)
Update Portuguese-Brazil locale | thanks to oliveirafabio
Firefox: make the manifest Firefox 47 compatible