Caching support added, I don't know how much use of it will be, but it didn't make sense to regenerate list for every export , for example one with seconds apart, it's disabled by default so it didn't change extensions set behavior.
History export/import extension for firefox. backup and restore history using this add-on.
Export your history as single .json file and then import back. You can use different predefined timelines or select your period with date input.
After installing , open Sidebar with Ctrl+B and switch to heximo from dropdown,
or use context menu item (extension adds an entry) to open extension sidebar directly.
The software is distributed AS IS, NO WARRANTIES ARE GIVEN OR IMPLIED.