I am working on FireMonkey 3.0.

• FireMonkey 1 had a home-grown editor
• FireMonkey 2 started with CodeMirror editor
• FireMonkey 3 will have Monaco Editor

Completed

• Added "Convert to UserCSS" option to Monaco Editor (where applicable)
• Added "innerText", "innerHTML" support to "GM addElement"
• Added "@antifeature" to popup Info page
• Added default templates for New script/CSS from toolbar popup (support/issues/628)
• Added ESLint (9.29.0)
• Added feature to pass tab URL to new Script/CSS from toolbar popup (support/issues/628)
• Added Keyboard shortcut feature
• Added Light/Dark theme to GM popup
• Added links to Help from Options
• Added Monaco Editor (0.52.2) with IntelliSense (support/issues/623, Editor & Linter #3)
• Added Sidebar Editor feature
• Added UserScript Wrapper (allows "return out of function" and "top-level await")
• Changed "@var" range to number input
• Deprecated browser API style metadata block entries
• Deprecated xStyle compatibility features
• Dropped storing of "@antifeature, @author, @description"
• Fixed an issue in processing userCSS "@var" (from 2.68)
• Increased minimum version to Firefox 128 (released 2024-07-09) due to Firefox root certificate expiry on 2025-03-14
• Moved "GM.info.script.injectInto" to "GM.info.injectInto" to match Violentmonkey
• Moved multi storage APIs back under "GM getValues, GM setValues", "GM deleteValues" (support/issues/545) (created in 2.68 2023-03-30, changed in 2.69)
• Removed "browser_style" in preparation for MV3
• Removed "Convert to UserCSS" option from Direct Install
• Removed "GM createObjectURL" API (support/issues/558) (from 2.68)
• Removed "GM import" (support/issues/558) (from 2.68)
• Removed a few known properties from "GM info"
• Removed CodeMirror editor
• Removed CSSLint
• Removed js-beautify
• Removed JSHint
• Removed multi storage API options from "GM getValue", "GM setValue", "GM deleteValue" (support/issues/545) (from 2.69)
• Removed pre-2.68 (2023-05-29) migrate
• Removed PSL (Public Suffix List) module API (support/issues/503) (from 2.68)
• Updated "GM addValueChangeListener" to listen to other tabs only
• Updated "GM fetch" (breaking change)
• Updated "GM.xmlHttpRequest" to return a Promise (breaking change)
• Updated "@inject-into" page to concatenate all "@require" into the same function scope
• Updated CodeMirror to 5.65.19 (standalone for Direct Install page only)
• Updated GM API in preparation for MV3
• Updated GM API to depend on "@grant"
• Updated import from Stylus (2.3.14)
• Updated Options page user interface
• Updated Toolbar popup user interface
• Updated UserStyle implementation with regex() support

Multi Storage APIs

• FM 2.68 ( 2023-03-30) added multi storage API under getValues, setValues, deleteValues
• FM 2.69 (2023-06-01) moved multi storage API under getValue, setValue, deleteValue
• VM 2.19.1 (2024-06-19) added multi storage API under getValues, setValues, deleteValues
• TM 5.3.0 (2024-09-15) added multi storage API under getValues, setValues, deleteValues
• FM 3.0 (2025-?-?) moved multi storage API back under getValues, setValues, deleteValues

To Do

• All feature request will be considered
• Future user style development will concentrate on userCSS format (userStlye support will remain as is)