В chromium 90 работает DjVu.js v.0.5.3, DjVu.js Viewer v.0.8.2. В firefox 88 (и более ранних) просто пустое окно. Последняя версия которая работает у меня - 0.3.5.
Uncaught
Exception { name: "NS_ERROR_NOT_IMPLEMENTED", message: "", result: 2147500033, filename: "https://ptah-alexs.info/djvu_reader/djvu.js", lineNumber: 13330, columnNumber: 0, data: null, stack: "DjVuScript@https://ptah-alexs.info/djvu_reader/djvu.js:13330:51\nDjVu<@https://ptah-alexs.info/djvu_reader/djvu.js:15534:26\n@https://ptah-alexs.info/djvu_reader/djvu.js:15536:2\n" }
columnNumber: 0
data: null
filename: "https://ptah-alexs.info/djvu_reader/djvu.js"
lineNumber: 13330
message: ""
name: "NS_ERROR_NOT_IMPLEMENTED"
result: 2147500033
stack: "DjVuScript@https://ptah-alexs.info/djvu_reader/djvu.js:13330:51\nDjVu<@https://ptah-alexs.info/djvu_reader/djvu.js:15534:26\n@https://ptah-alexs.info/djvu_reader/djvu.js:15536:2\n"
<prototype>: ExceptionPrototype { toString: toString(), name: Getter, message: Getter, … }
djvu.js:13330
Uncaught Error: There is no DjVu object! You have to include the DjVu.js library first!
<anonymous> https://ptah-alexs.info/djvu_reader/djvu_viewer.js:2
n https://ptah-alexs.info/djvu_reader/djvu_viewer.js:2
<anonymous> https://ptah-alexs.info/djvu_reader/djvu_viewer.js:2
<anonymous> https://ptah-alexs.info/djvu_reader/djvu_viewer.js:2
djvu_viewer.js:2:206562
Uncaught TypeError: DjVu is undefined
onload https://ptah-alexs.info/djvu_reader/:21
djvu_reader:21:13