Mozilla release an emergency update for the Firefox 40 branch on Thursday, August 27th with Firefox 40.0.3 release. This release addressed the following issues:
- Disable the asynchronous plugin initialization (1198590)
- Fix a segmentation fault in the GStreamer support (GNU/Linux) (1145230)
- Fix a startup crash when using DisplayLink (Windows Only) (1195844)
- Fix a regression with some Japanese fonts used in the <input> field (1194055)
- On some sites, the selection in a select combox box using the mouse could be broken (1194733)
- Some search partner codes were missing (1195683)
- Various security fixes
User should be prompted to update or can do so manually via Help > About Firefox or download and install the latest version via getfirefox.com. The next planned release is Firefox 41 on September 22nd.