So have you explored the suggestion that it maybe security software - what AV are you using
Comodo Ice dragon is based on Firefox
I suggest you turn of your AV temporarily and see if that allows bookmarks and history to function
I am sure the same procedure for Firefox will function on Comodo
https://support.mozilla.org/en-US/kb/fix-bookmarks-and-history-will-not-be-functional
HOWEVER I cannot guarantee it, but the worst that can happen is that you will - be as you are now
The bookmarks are stored in Firefox
This error happens when a database file that stores bookmarks and browsing history (places.sqlite) and related site icons (favicons.sqlite) can't be accessed by Firefox.
https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data
I cannot find similar on IceDragon
https://help.comodo.com/uploads/helpers/Comodo IceDragon ver.65.0 User Guide.pdf
but I am reasonably certain it will be the same