Feature reference

Need to check what a button does, where it appears, or whether it is on by default? Start here. Step-by-step walkthroughs live in the manual.

Reader

The ChatGPT page is good for chatting. It is not always good for reading one dense answer. Reader gives that answer its own calmer surface, then lets you return.

Feature	Where to open	Default / state	Good for
Open Reader	Message toolbar -> Reader	Toolbar action	Open the current answer in Reader. Long paragraphs, code, tables, and formulas are easier to read there.
Markdown rendering and cleanup	Reader body	Automatic	Headings, lists, tables, code blocks, and formulas are preserved where possible. Unsafe HTML is removed.
Heading outline	Settings -> Reader -> Show Heading Outline	On by default	When an answer has several headings, Reader shows a small outline.
Outline jump and active heading	Reader outline rail	Shown when multiple headings exist	Jump to a heading and keep track of the current section while scrolling.
Render code blocks	Settings -> Reader -> Render Code Blocks	On by default	Code answers render as code blocks. Turn it off when you want a lighter Reader.
Code block copy	Reader code block button	Shown inside code blocks	Copy a code block directly instead of selecting it from the full answer.
Pagination and arrow keys	Reader footer	Automatic	Move through answers one page at a time instead of turning the Reader into one endless scroll.
Fullscreen reading	Reader header -> fullscreen button	Reader action	Use it when the answer is long and you want the surrounding ChatGPT page out of the way.
Reader content width	Advanced Settings -> Reader content width	1000px default, adjustable 480-1600px	Widen it on a large display, narrow it when you want tighter reading.
Locate source message	Reader footer locate action	Reader action	Return to the original ChatGPT message after reading, then copy, annotate, or ask a follow-up.
Send from Reader	Reader footer -> Send	Reader action	Send a follow-up or prepared annotation text back to the ChatGPT composer.
Sticky temporary excerpts	Reader selection -> Stick	Kept for the page lifetime	Pin a few passages beside the Reader while you compare them. They clear after refresh.
Sticky panel organization	Reader left Sticky panel	Collapsible, deletable, draggable	Build a temporary working set while reading, then decide what to save, copy, or ask about.

Copy and formulas

Copying should keep usable source: Markdown, LaTeX, and content blocks that do not break halfway.

Feature	Where to open	Default / state	Good for
Copy current message Markdown	Message toolbar -> Copy Markdown	Toolbar action	Copy the current answer, not the whole page or the last visible message by accident.
Copy current message as PNG	Hover action on Copy Markdown	Shown when browser policy allows	Turn one answer into an image when that is easier to share.
Copy current Reader page	Reader -> Copy	Reader action	Copy the current Reader page using the same content rules as toolbar copy.
Source-aware Reader selection	Reader body selection + Cmd/Ctrl+C	Reader selection action	Select only what you need. Formulas, code blocks, tables, and images are copied as closed source units where possible.
Formula click copies Markdown	Click a formula; configurable in Settings	On by default	Click a formula and get its LaTeX / Markdown source without digging through the rendered output.
Formula hover actions	Hover a formula after enabling actions in Settings	All off by default	Enable PNG, SVG, or MathML copy/save only when you need those assets.

Annotations and follow-up

When one sentence needs a note or follow-up, write next to the source text. Later, turn those notes into a prompt.

Feature	Where to open	Default / state	Good for
Add annotation	Reader selection -> Annotate	Reader selection action	Comment on the selected sentence or paragraph without describing its location in another document.
Edit / delete annotation	Reader gutter anchor or annotation popover	Kept for the page lifetime	Revise notes while reading. They are temporary and clear after a full refresh.
Copy annotations	Reader header -> Copy annotations	Available when annotations exist	Build a numbered list from the source snippets and your notes.
Insert annotations	Reader send popover -> Insert annotations	Available when annotations exist	Place prepared annotations into the send box and skip a copy-paste step.
User prompts	Settings -> Reader -> User prompts	Three starter prompts included	Save common revision instructions, such as editing point by point.
Annotations copy template	Settings -> Reader -> Annotations copy template	Default template includes selected source and user annotation tokens	Decide the format used when annotations are copied.
Prompt position	Settings -> Reader -> Place prompt below annotations	Prompt on top by default	Put the prompt before or after the annotation list.

Bookmarks and saved material

Some answers are not needed right now, but you know you will look for them later. Bookmarks save the content and the way back.

Feature	Where to open	Default / state	Good for
Save / remove bookmark	Message toolbar or Reader header -> Bookmark	Toolbar action	Save an important answer and the location needed to return to it.
Save dialog and folders	When saving a bookmark	Available	Name a bookmark and place it in a folder for a project, topic, or writing task.
Search and sort	Bookmarks panel	Sort by time or A-Z	Find saved material by query, time, or alphabetic order.
Bookmark preview	Click a bookmark row	Uses Reader	Preview saved content in the panel before jumping back to the source page.
Go / Copy / Delete	Bookmark row actions	Available	Jump to the source, copy content, or remove an old bookmark from the same row.
Bulk delete, move, export	After selecting bookmarks in the panel	Available	Clean up multiple bookmarks at once, useful when a project wraps up.
Import / export backup	Bookmarks panel or Data & Storage	JSON file	Export a copy before reinstalling the browser, switching devices, or making big changes.
Context-only save	Settings -> Toolbar & Page Actions	Off by default, keeps 500 chars	Turn it on to save storage. Previews are shorter, but source-page navigation still works.

Export and sharing

When an answer needs to go into notes, a project archive, or someone else's inbox, export it.

Feature	Where to open	Default / state	Good for
Save Messages	Message toolbar -> Export / Save as	Shown by default	Open the export dialog at the current answer, then select more messages if needed.
Markdown export	Save Messages -> Markdown	Available	Use it for notes, repositories, documents, or any workflow where editing continues.
PDF export	Save Messages -> PDF	Browser print flow	Useful for a finished handoff, archived long answers, or preserving a readable layout.
PNG / ZIP export	Save Messages -> PNG	Single item as PNG, multiple items as ZIP	Share one answer as an image, or package several answers as a ZIP.
PNG image width	Settings -> Toolbar & Page Actions	Desktop 800px default; mobile 390, tablet 640, custom 360-1200	Set width for the destination: mobile screenshots, desktop docs, and web assets do not need the same size.
PNG image scale	Settings -> Toolbar & Page Actions	1x default, adjustable 1x-3x	Raise the scale for sharper output; very long exports may be capped for stability.
Deep Research cleanup	Markdown / export pipeline	Automatic	When exporting Deep Research content, the pipeline trims avoidable noise.

Settings reference

The defaults cover normal use. This section is for people who want to trim the toolbar, tune Reader, adjust PNG export, or change small interface details.

Group	Setting	Default / value	What changes
Platforms	Enable extension on ChatGPT	On by default	This is the main switch. The site and copy are written around ChatGPT-first use.
Platforms	Chrome / Firefox install paths	Chrome Web Store / Firefox Add-ons	The public install paths stay limited to these two so support is clear.
Toolbar	Save Messages	Shown by default	Decides whether Save as appears in the toolbar.
Toolbar	Word Count	Shown by default	Shows word and character counts for the current message or Reader content.
Bookmarks	Context-only Save	Off by default; keeps 500 chars	Use it to save storage. The tradeoff is shorter previews.
Formula	Formula click copies Markdown	On by default	Click a formula to copy its LaTeX / Markdown source.
Formula	Formula image actions	All off by default; can enable PNG/SVG/MathML copy and PNG/SVG save	Enable these only when you need formula images or MathML, so they stay out of the way.
Reader	Render Code Blocks	On by default	Shows formatted code blocks in Reader; disabled mode uses placeholders.
Reader	Show Heading Outline	On by default	Shows a small outline when the page has multiple Markdown headings.
Reader	Place prompt below annotations	Off by default	Decides whether the prompt appears before or after copied annotations.
Reader	User prompts	Three starter prompts, editable	Save common revision instructions so you do not rewrite them every time.
Reader	Annotations copy template	Single template with selected source and user annotation tokens	Decides what copied annotation text looks like.
Export	PNG image width	Mobile 390 / Tablet 640 / Desktop 800 / Custom 360-1200	Sets the exported image card width.
Export	PNG image scale	1x default, adjustable 1x-3x	Sets sharpness. Very long images may still be capped.
ChatGPT	Keep position after sending	Off by default	When sending from an older spot in the thread, avoid being pulled to the bottom.
Language	Interface language	Auto / English / Simplified Chinese	Follow the browser language or set one manually.
Data	Storage usage	Shown in Settings	Shows how much local extension storage is being used.
Data	Export All	Manual button	Export bookmarks before uninstalling, reinstalling, or switching devices.
Advanced	Global font size	16px default, adjustable 12-20px	Adjusts text size inside AI-MarkDone UI.
Advanced	Theme color	Default blue; emerald, violet, rose, and amber available	Changes the accent color for buttons, links, focus rings, and selected states.
Advanced	Reader content width	1000px default, adjustable 480-1600px	Sets the maximum width of the Reader body.

Start with Reader and Markdown copy.

That path covers the usual job: read the answer properly, then move the useful part where it belongs.

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