It is necessary to enable developer mode to run userscripts via Tampermonkey now.
Instructions on how to enable it can be found 
here.
        
 
        
  
  Opera
  
  General
  
  Fixed the configuration of script positions via drop down menu
  
  Setting sandboxed window.location now navigates via background context
  
  Fix GM.cookie.list() to resolve also if called without an argument
  
  Allow GreasyFork's install button to update correctly after moving a script to the trash
  
  Fixed issue with listening for menu command access keys
  
  Resolved issue where GM_registerMenuCommand entries reappeared until clicked
  
  Fix relative externals in @require and @resource
  
  Resolved issues with protocol-relative URLs in GM_xmlhttpRequest
  
  Ensured GM_xmlhttpRequest retains specified request headers during redirects
  
  Resolved issue with back navigation on the intermediate script installation page
  
  Resolved issues with cloud functions on the options page
  
  Corrected the sorting of menu commands after updates
  
  Added a setting to control whether GM_cookie should be able to access HttpOnly cookies
  
  Fixed sometimes wrong GM_xmlhttpRequest response header separator
  
  Added button to force update externals
  
  Fixed header-derived filenames in GM_download
  
  Fixed occasional incorrect response headers in GM_xmlhttpRequest
  
  Fixed GM_xmlhttpRequest.finalUrl to include hash components again
  
  Reworked counting of executed script instances
  
  Enhanced back/forward cache navigation handling
  
  Fixed an GM_registerMenuCommand issue with non-letter accessKeys
  
  Fixed another GM_xmlhttpRequest cookie issue
  
  Fixed several GM_xmlhttpRequest cookie issues
  
  Fixed storage change listeners after clicking a download link
  
  Fixed issues with GM_registerMenuCommand if the command was registered multiple times (e.g. from different frames)
  
  Enabled GM_cookie for all versions (HttpOnly cookie access still only at the beta versions)
  
  Added a warning message when a script without @include and @match entry is saved the first time
 
  
  Locales
  
  Updated Ukrainian translation | thanks to click0
 
  
  Updated Portuguese-Brazil translation | thanks to igorruckert
 
  
  Updated Italian translation | thanks to bovirus
 
  
  Updated Japanese translation | thanks to shirayuki
 
  
  UI
  
  Fixed saving of checkbox and text inputs via the save button
  
  Fixed opening menus at the popup by clicking the name
  
  Added a button to disable script updates at the update dialog
  
  Improved editor search functionality
  
  Fixed code selection near the top and bottom of the editor
  
  Fixed editor height issue in mobile views
  
  Show an error icon at scripts without any @include and @match entry
  
  Chrome
  
  Enhanced parallel execution of GM_xmlhttpRequest
  
  Fixed Dropbox, OneDrive, and WebDAV sync to correctly write userscript source code
  
  Improved WebDAV sync performance
  
  Added some robustness to the service worker start by gracefully handling some more errors
  
  Fixed GM_download sometimes downloading files in wrong encoding
  
  Fixed an issue with language selection
  
  Fixed popup menu update
  
  Fixed dark mode detection
  
  切换到Manifest V3
  
  Chrome
  
  Fixed @noframes support in dynamic userScripts mode
  
  Resolved additional MV3 GM_xmlhttpRequest issues
  
  Fixed disabling Tampermonkey in dynamic userScripts mode
  
  Fixed auto page reload functionality in dynamic userScripts mode
  
  Resolved issues with external page connectability being intermittently unavailable
  
  Addressed occasional failures in script registration in userScript dynamic mode
  
  Streamlined the script installation process for a smoother experience
  
  Fixed an GM_xmlhttpRequest issues with non-ASCII header values
  
  Fixed an issue that made some local file URLs inaccessible
  
  Fixed support for script installation via drag-and-drop in any browser tab
  
  Speeded up UserScripts Dynamic Mode to support real document_start
  
  Made @sandbox DOM mode work again
  
  Sync
  
  Fixed synchronization issues with WebDAV
  
  MV3
  
  Improved script installation to not download the script content in parallel anymore
Note: you can restore the old behavior, by changing Userscript URL detection to Legacy
  
  Known Issues
  
  GM_webRequest 在Manifest V3中尚未(暂时)支持