For users who prefer not to install extensions, web-based tools like FlipHTML5Download.com
Free, no malware risk. Cons: Extremely slow for books over 50 pages; won't work if pages are loaded as sprites or canvas elements. Fliphtml5 Downloader
The "FlipHTML5 Downloader" is a utility born out of the tension between web-based interactivity and the user's desire for offline access. While the technology works by scraping and stitching image tiles, the "proper" use is determined by the copyright status of the document you are trying to save. For users who prefer not to install extensions,
Attempts to preserve the original text clarity and image resolution. web-based tools like FlipHTML5Download.com Free