Attached you find the new version 1.2.4.
Here is what I changed:
- Now it's possible to set a bookmark in an ePub-file. An ePub-file opens automatically at the position of the bookmark.
- EPUBReader adds now a margin to each ePub-file.
- Margins and background-color of the ePub-content can now be changed via the preferences window. When you change the background-color, please reload your ePub-files. Otherwise the background-color of the TOC on the left side will be changed too.
- EPUBReader is now more fault tolerant concerning the content of the ePub-files. Now there are less ePub-files which can't be read.
For experts: when ncx-file was missing or an entry in manifest was missing, which was referenced in spine, the epub didn't open before.
Please let me know if you experience any problems and for the case you like the new features, I'm also very happy to hear from you

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I'll wait a bit until I upload this new version to the Mozilla website. The Mozilla reviewers are not so happen if you permanently upload new versions because they need to test it every time.