Mozilla®, Firefox® and the Firefox logo are registered trademarks of the Mozilla Foundation and are used under license. Although the Firefox Portable launcher no longer uses any of their code, their past contributions helped get the app where it is today. Many thanks to Gerard Balagué (mai9), tracon, FlashBanG and all the folks participating in the mozillaZine forum thread for their ideas, suggestions and support.

I think I'll stay with this version until mozilla fixes it.

I reverted back to Firefox 40.0.3 and the problem disappeared. I'm using a custom theme in Win 7 home premium 64 bit.

MD5 Hash: 98a52decc6a9d0db91bc77d41a97c07e Hi, No I'm not using a high contrast theme. Source Code: Launcher (included), Firefox License: Free / Open Source (Launcher: GPL, Firefox: MPL/GPL/LPGL under Mozilla EULA) System Requirements: Windows XP/Vista/7/8/10, Wine on Linux/UNIX Plus, thanks to the launcher bundled in the Mozilla Firefox, Portable Edition, it leaves no personal information behind on the machine you run it on, so you can take your favorite browser along with all your favorite bookmarks and extensions with you wherever you go. It has lots of great features including popup-blocking, tabbed-browsing, integrated search, improved privacy features, automatic updating and more. Mozilla Firefox is a fast, full-featured web browser that's easy to use. Mozilla Firefox®, Portable Edition is the popular Mozilla Firefox web browser bundled with a Launcher as a portable app, so you can take your bookmarks, extensions and saved passwords with you.

Mozilla firefox 41.0.2