Fixed in 2.3.0

• Preserved buffered books until a new page or selection is successfully extracted, preventing failed captures from deleting existing chapters.
• Added unique job IDs and ownership checks so stale heartbeats or completion messages cannot interfere with newer captures.
• Replaced endless popup spinners with clear errors for restricted tabs, busy jobs, missing responses, and interrupted captures.
• Detected storage write failures throughout the popup and editors instead of incorrectly reporting that changes were saved.
• Warned before closing the chapter editor with unsaved book, metadata, CSS, chapter, order, or removal changes.
• Kept chapters with blank titles, added safe fallback titles, and focused the empty title before generation rather than silently dropping content.
• Captured responsive, <picture>, srcset, and common lazy loaded images more reliably, including pages that use placeholder pixels.
• Reported images omitted because downloads were blocked or their formats were unsupported, while still producing the eBook.
• Rounded and validated generated SVG and image dimensions so fractional or invalid values no longer break EPUB validation.
• Generated deterministic, unique chapter and stylesheet filenames, preventing collisions, overwritten chapters, and invalid manifests.
• Strengthened language tag and date validation, including stored metadata from older versions, so invalid values cannot reach the EPUB package.
• Restricted MathML attributes by element and normalized unsupported constructs, preventing invalid formulas from invalidating the book.
• Replaced regex based CSS resource filtering with a tokenizer that handles escapes, comments, nested functions, image-set(), imports, and other disguised remote references.
• Removed or repaired missing local CSS resource references, including incorrect image paths, before packaging the EPUB.
• Avoided creating an empty images/ directory in text only books, eliminating the associated EPUBCheck warning.
• Rejected overly long or potentially catastrophic style library regular expressions so matching cannot freeze the extension.
• Removed dead helper code and implicit global XPath utilities that could throw or leak state.
• Expanded automated coverage for capture failures, popup recovery, editor persistence, sanitization, image handling, stylesheet safety, and warning free EPUBCheck output.

v2.2.0
* Introduced a new Style Library with 24 built-in styles, live previews, visual element removal, filtering, and import/export.
* Added “Review Before Saving” to edit content, metadata, and CSS before generating an eBook.
* Improved MathML compatibility across major eBook readers.
* Added complete localization for English, French, Brazilian Portuguese, and Russian.
* Expanded automated testing and EPUB validation.

Added in 2.1.0
- add support for EPUB 3
- add option to apply Readability.js on Save Page and Save Page as Chapter

Previous published version: 1.4.2. This is a full rewrite of the extraction and
background code onto Manifest V3.

The add-on no longer asks for access to your data on
all websites. It now runs on activeTab only, and its code is loaded into a page

Added MIME type to the generated .epub file

- Remove unnecessary permissions
- Detect image type if the URL doesn't have a file extension (jpg, gif, png)
- Reset the Busy indicator on errors
- Remove hidden elements when style is not included
- Replace iframes with divs

Added in 1.4
- Smaller ebook file size
- Fix for #37 - custom styles not applied
- Fix for #36 - br tag missing from pre blocks
- Fix for #31 - hanging in Busy state
- Other misc bug fixes

Update links for 3rd party libraries