Ferna PDF Reader by TGI Fernando
Read and annotate PDFs in Firefox: fit-to-width pages, smooth word selection (even in LaTeX), figure and table popups, Sinhala support, auto-bookmarks, Xodo-style stylus and a private on-device AI for summaries and quizzes.
Extension Metadata
About this extension
Ferna PDF Reader opens PDFs in Firefox with every page, portrait or landscape, fitted to the width of the window. It is designed for students, researchers and anyone who reads a lot of PDFs.
NEW IN 1.4
- Smooth, Xodo-style text selection that selects whole words, even in two-column LaTeX papers
- Sinhala support: repairs Sinhala text that other viewers show garbled, for selecting, copying, searching and AI
- Sinhala AI: summaries, questions and quizzes in Sinhala
- Auto-Bookmark: builds a bookmark tree from the table of contents or the headings
- Reference popups with your own default size and zoom (set in Settings), still resizable and zoomable with the mouse
FEATURES
- Zoom (fit width, fit page, percentages) and page rotation from the toolbar or a small menu on the page
- Reference popups: clicking "Figure 3", "Table 2" or an equation number shows it in a floating window instead of jumping away
- Annotations: highlight, underline, strike-out, squiggly, area highlight, pen, marker, text boxes, notes and shapes. The tool panel hides itself as soon as you pick a tool, and a quick popup appears when you select text.
- Stylus like Xodo: a pen writes at any time without choosing the Pen tool, with smooth ink and palm rejection
- AI assistant that runs on your own computer (WebGPU) or on a local server such as Ollama: summaries with page references, questions about the document, study quizzes
- Password protection (AES-256 / AES-128) and standard PDF annotations that open in every PDF reader
PRIVACY
No account, no analytics, no ads, no tracking. Your PDFs never leave your computer.
OPTIONAL FOR WINDOWS
The free Ferna save helper lets Ferna open PDFs from your disk and save straight over them (Ctrl+S) without a Save window. Download: https://tgi25.github.io/ferna-software/ferna-pdf-reader/
SUPPORT FERNA
Ferna PDF Reader is free and is built and maintained by one developer. If it saves you time and boosts your productivity, you can support its development here: https://buymeacoffee.com/fernasolutions
NEW IN 1.4
- Smooth, Xodo-style text selection that selects whole words, even in two-column LaTeX papers
- Sinhala support: repairs Sinhala text that other viewers show garbled, for selecting, copying, searching and AI
- Sinhala AI: summaries, questions and quizzes in Sinhala
- Auto-Bookmark: builds a bookmark tree from the table of contents or the headings
- Reference popups with your own default size and zoom (set in Settings), still resizable and zoomable with the mouse
FEATURES
- Zoom (fit width, fit page, percentages) and page rotation from the toolbar or a small menu on the page
- Reference popups: clicking "Figure 3", "Table 2" or an equation number shows it in a floating window instead of jumping away
- Annotations: highlight, underline, strike-out, squiggly, area highlight, pen, marker, text boxes, notes and shapes. The tool panel hides itself as soon as you pick a tool, and a quick popup appears when you select text.
- Stylus like Xodo: a pen writes at any time without choosing the Pen tool, with smooth ink and palm rejection
- AI assistant that runs on your own computer (WebGPU) or on a local server such as Ollama: summaries with page references, questions about the document, study quizzes
- Password protection (AES-256 / AES-128) and standard PDF annotations that open in every PDF reader
PRIVACY
No account, no analytics, no ads, no tracking. Your PDFs never leave your computer.
OPTIONAL FOR WINDOWS
The free Ferna save helper lets Ferna open PDFs from your disk and save straight over them (Ctrl+S) without a Save window. Download: https://tgi25.github.io/ferna-software/ferna-pdf-reader/
SUPPORT FERNA
Ferna PDF Reader is free and is built and maintained by one developer. If it saves you time and boosts your productivity, you can support its development here: https://buymeacoffee.com/fernasolutions
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Permissions and data
Required permissions:
- Exchange messages with programs other than Firefox
- Download files and read and modify the browser’s download history
Optional permissions:
- Access your data for all websites
Data collection:
- The developer says this extension doesn't require data collection.
More information
- Add-on Links
- Version
- 1.4.1
- Size
- 4.69 MB
- Last updated
- 8 days ago (Oct 19, 2026)
- Related Categories
- License
- All Rights Reserved
- Privacy Policy
- Read the privacy policy for this add-on
- Version History
- Add to collection