Created attachment 8584437 [details] ReadingList-ArticleChange-AddButtonFlicker.mp4 While switching articles in Reading List the "Remove from Reading List"-Button shortly shows the plus-Sign instead of the minus-Sign although both articles are in the Reading List. see video.
Reproducible on Windows 8.1 (x64) as well.
status-firefox38: --- → affected
status-firefox39: --- → affected
OS: Mac OS X → All
Hardware: x86 → All
Product: Firefox → Firefox Graveyard
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