To use these add-ons, you'll need to download Firefox.

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Iceggiren i Reading Ruler

Reading Ruler sɣur Oren Trutner

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Icegger-it Aseqdac Firefox 16147312
sɣur Aseqdac Firefox 16147312, pred 5 leti
Works great. Pretty much what I was looking for. Would have, however, loved a universal toggle to quickly switch the Ruler Mode on/off across websites.

Tiririt n ineflayen

yeffeɣ-d deg pred 3 leti
I hear you. Turning the ruler on or off for all sites appears to be the top requested feature. Version 1.8 adds a global on/off switch at the top of the options menu. You can also use the Alt+R hotkey to toggle the ruler for all sites.