Over the years I’ve used a few highlighting tools and I like Textmarker the best. Initially I had some problems with it not highlighting text at some sites. However, the developer fixed those problems in versions 1.4.0 and 1.4.2. Consequently, for the last couple months it’s been working great and can highlight text at nearly any site.

Further edit: With the latest version (1.4.0), this issue has been somewhat fixed. Bumped up the rating.
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Edit: It isn't an incompatibility - the issue exists on a fresh profile with only Textmarker installed as well. Please look into it.
Original review:
Has an incompatibility with FindBar Tweak: If Textmarker is enabled, the search highlights in pdf's appear in front of the text, covering the text. Please see https://github.com/Quicksaver/FindBar-Tweak/issues/219 for screenshots / more details.
Works great otherwise. Thank you.

Hi
There is a problem with save and copy keyboard shortcuts.
ctrl, alt, and shift + s & c are not good ideas because interfere with native shortcuts.
ctrl+alt is also not a good idea because we normally use it as a universal keyboard shortcut for lunching windows programs.
ctrl+shft+S & C are both taken by damn webdeveloper and there is no way to get rid of that in FF.
alt+shft+S brings on the history menu
please let users to choose other letters than S & C this way maybe we can find a working keyboard shortcut.

keep up the good work
Thank you

No advanced settings menu , history & help buttons work ! impossible to change colors on FF 39.0 !

fantastic! better than the ones i used to use. congrats!

the best addon, ty

Perfect tool to use! Thank you. Only one bug to fix, the right-click context menu setting couldn't be kept after restarting browser.

just what was needed

History can save automaticaly?

Works awesomely. A lot of work has gone into its development. Thanks to developer. A must for Up and coming slot. A future featured.

finally a textmarker tool that works. thanx! :)