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I want to know if Mozilla Beta V8 is compatible with Sothink Web Video Downloader add-on. V7 was not.

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I did not upgrade to Beta Version 7 because it specifically identified incompatibility with Sothink Web Video Downloader. Has this been rectified in Version 8?

I did not upgrade to Beta Version 7 because it specifically identified incompatibility with Sothink Web Video Downloader. Has this been rectified in Version 8?

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Many addon developers don't support Beta versions of Firefox, so it is best to stick with the release versions of Firefox for those addons.

https://addons.mozilla.org/en-US/firefox/addon/sothink-web-video-downloader/

Version 6.3 
Released September 1, 2011 313.3 KB 
Works with Firefox 2.0 - 7.*
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Thanks for the quick response. I'll go with V6.3 as you recommend.