Comodo Dragon 126.96.36.199
Firefox 19.* - 21.0
Opera 12.10 - 12.15
Windows 7 professional 64 bit
#1 - I export bookmarks from Firefox to a html file: round about 22000+ bookmarks into file size 3.7 MB. #2 - I export bookmarks from Opera to a html file: round about 22000+ bookmarks into file size 1.9 MB. #3 - I try to import the Firefox bookmarks file into Comodo Dragon #3/a - import stops after estimated 10 % #3/b - only one of my 1st level bookmarks folders (under Firefox’ bookmarks toolbar folder) was imported. #3/c - three other folders from 3rd level folders were imported, strangely without their upper folder. #4 - I try to import the Opera bookmarks file into Comodo Dragon: with success!
Comodo Dragon seemingly shows a bug while importing large html bookmark files with a size of 3.7 MB, or the problem could be found within the structure of the Firefox bookmarks file. The Opera bookmarks html file, with the identical 22000+ bookmarks but smaller with only 1.9 MB correctly works.
Where is the difference / problem / bug in Comodo Dragon?
To add to the captains reply, it may well be a size problem. I can import my firefox bookmarks without issue, but the file size is only 750KB. Have you tried a direct import from firefox, instead of using HTML?