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Rated 2 out of 5 stars
За то, что удаляете отзывы, которые вам не нравятся.This review is for a previous version of the add-on (0.4.0.1.1-signed).
Are you the same person that posted a problem report a few hours ago? I'm sorry to hear about that. The icon disappearing is a problem that I have never been able to reproduce. I suspect it's related to another add-on in your icon bar that changes it's width (LinguaLeo? Ghostery?). The problem is probably somewhere in Mozilla's SDK. Try putting the two icons in different toolbars or disabling SDC's icon in the preferences.
PS: I can't remove your post and did not flag it either. Another user must have reported it, probably because it was in russian. (see https://addons.mozilla.org/en-US/firefox/addon/self-destructing-cookies/reviews/ -- every logged in user can flag any post).