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Rulers can be unlocked, so that one of the rulers will scroll along the page and the other will be always visible. Extension icon is a Toogle button, you can click the ruler_guides icon to hide all the guides completely.
For details visit: https://github.com/mark-rolich/RulersGuides.js
Source code: https://github.com/joshijitendra/rulerguides
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open licenses to the best of our knowledge. If you are an author and would like anything removed,
then please write an e-mail to legacy [at] collector dot org.