Mozilla release an emergency update for the Firefox 41 branch on Wednesday, September 30th with Firefox 41.0.1 release. This release addressed the following issues:
- Startup crash in mozilla::layers::CompositorD3D11::GetTextureFactoryIdentifier()
- Changing properties of a new bookmark while adding it acts on the last bookmark in the current container
- Firefox hangs with flash plugins
- Startup crash in nsStyleSet::GatherRuleProcessors(nsStyleSet::sheetType) possibly related to Yandex toolbar and Adblock Plus
- Crash in mozilla::gl::GLBlitHelper::BlitImageToTexture
User should be prompted to update or can do so manually via Help > About Firefox or download and install the latest version viagetfirefox.com. The next planned release is Firefox 42 on November 3rd.