Greasy Fork is available in English.
Track and highlight visited and watched* fanfiction links across the following sites: AlternateHistory*, DarkLordPotter*, QuestionableQuesting*, SpaceBattles*, SufficientVelocity*, FanFiction, HPFanfiction, PatronusCharm, also highlight them in some old subreddits.
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Track and highlight visited and watched links on these sites:
- visited & watched (Xenforo only): AlternateHistory, DarkLordPotter, QuestionableQuesting, SpaceBattles, SufficientVelocity
- visited: (m.)fanfiction.net, hpfanfiction.org, patronuscharm.net.
- Old reddit: highlights only, across a few subs.
New: persistent Auto/Manual footer toggle. In Auto mode, links are marked visited when you open them. In Manual mode, you need to click the thread title inside. I prefer Manual mode myself, but it defaults to Auto. (note: Manual mode adds a second easier-to-reach title.)

Tested on Firefox desktop&mobile with ViolentMonkey(&TamperMonkey).
Features:
• When a link is clicked, add its {id} and Xenforo {name}* to plugin storage.
• Highlight visited threads in purple (by id).
• Highlight names visited on another forum in pink (across Xenforo).
• Highlight watched threads in yellow (looks for the native Xenforo watched bell icon) Note: Icon not present in Search only Forum view.
• Add TXT export Backup/Restore buttons at the bottom of the page, and Remove latest highlight with 20s name+link popup.
• Turn the main title into a self-referential link (allows self-visiting in Manual mode).
• Multiple tab support, cache safe (no corruption from stale GM storage on back-forward navigation), live concurrent updates.