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Здравствуйте. Что именно у вас стряслось с закладками? Можете показать на скриншотах? 

Hello! Unfortunately, this version is not supported now.Try our new versions

for Chrome:

for Firefox:

And about constant location of downloading - you can do it in settings of your browser. You need to open 'setting' and find this. Then do as in the picture. Thank for your feedback.

you mean you have deleted the "Flash Video Downloader", again downloaded it from the store and again faced with this problem?

Hello! Unfortunately, uses videos from and Stream Video Downloader cannot download from youtube. You can use our downloader for Firefox, where you can download videos from youtube.

hello! you need to reinstall the addon to get round the problem.