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It seems this add-on has been disabling my page back arrow. I have just disabled it and the arrow has come back! Hope you find the cause.

Это отзыв для предыдущей версии этого дополнения (0.3.8.2.1-signed.1-signed). 

Which arrows you are mean? Back/forward buttons on the toolbar (works for me) or links on some site (which site?)?
Can you reproduce this on new empty Firefox profile?
https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles

Also this is probably related to https://github.com/Infocatcher/Right_Links/issues/4

And please use "Support site" from extension description to report bugs:
https://github.com/Infocatcher/Right_Links/issues
Reviews is uncomfortable (and wrong) place for such things.