Add Nova Cleanup Comments

Do not add cleanup comments if the user says "skip cleanup comments".

Add @nova-cleanup comments to Firefox newtab code following Project Nova implementation strategy.

Context

Project Nova uses a parallel development approach where classic newtab stays untouched and Nova changes live in isolated directories/conditionals. Cleanup comments serve as instructions for a future automated pass: when Nova ships, Claude will find all @nova-cleanup markers and execute the described cleanup autonomously. Write descriptions as direct, unambiguous instructions that Claude can act on without engineer input.

Comment Format

// @nova-cleanup(action): Instruction for Claude to execute during cleanup

Actions

• remove-directory - Delete entire classic directory
• move-directory - Move Nova/ up one level
• merge-styles - Move styles from nova/ to component locations
• remove-pref - Remove pref check
• remove-conditional - Remove conditional logic

Task

1. Read the specified file(s) or all modified files if none specified
2. Enter plan mode to identify Nova-related changes and propose the set of cleanup comments to add:
   • Pref checks for nova.enabled or similar
   • Conditionals based on Nova pref
   • Files in Nova/ directory
   • Files in styles/nova/ directory
   • Import statements choosing between classic/Nova components
3. After approval, add the cleanup comments:
   • For conditionals: @nova-cleanup(remove-conditional) with description
   • For pref checks: @nova-cleanup(remove-pref) with description
   • For Nova/ component files: @nova-cleanup(move-directory) at top of file
   • For classic component files that have Nova equivalent: @nova-cleanup(remove-directory) at top
   • For styles/nova/ files: @nova-cleanup(merge-styles) at top
4. Place comments immediately before the relevant code or at top of file for directory-level actions
5. Write descriptions as direct instructions Claude can execute without additional context or engineer guidance

Examples

// Entry point with component selection
// @nova-cleanup(remove-pref): Delete this line; replace Base with NovaBase everywhere in this file
const Base = prefs["browser.nova.enabled"] ? NovaBase : ClassicBase;

// Nova/Base/Base.jsx
// @nova-cleanup(move-directory): Move this file to components/Base/Base.jsx and update all imports

export class Base extends React.Component {
  // ...
}

Notes

• Don't add cleanup comments to pure CSS changes or shared components without conditionals
• If uncertain whether a comment is needed, ask the user
• Multiple cleanup comments in the same file are fine if there are multiple Nova-related changes
• Descriptions must be self-contained — Claude should not need to infer intent or ask follow-up questions to execute them