SearchDateLen by LaruYan KaPothoa

this add-on has only one display language: Korean
please see this help page for customizing your experiences https://github.com/SD810/SearchDateLen/blob/master/document/HelpEnglish.md

Get more finer control (customizable) for date range, more than just 1 day, 1 week, 1 month and 1 year, in search pages on Naver, Daum and Google.

adds 3 months, 6 months, 9 months, 1 year and a half, 2 years, first half, second half, first quarter, second quarter, third quarter, fourth quarter via preset, and you can add more like specific date range.

※I have explicit permission for publishing Firefox version of SearchDateLen.
see: https://github.com/SD810/SearchDateLen/pull/1#issuecomment-466643706