AddonBenchLeechBlock NG
Rule-based site blocker for users who want scheduled limits without an account.
LeechBlock NG blocks time-wasting sites on a schedule, supporting up to 30 block sets with their own site lists, time periods, and daily time limits. Options include lockdown mode, password protection, wildcard matching, site exceptions, and keyword filtering. It is maintained by James Anderson, works across Chromium browsers and Firefox, and is free.
