Once again, I'd like to highlight some new features that were pushed into git recently.
This issue #349 was now finally resolved thanks to S. Razi Alavizadeh. Along with other improvements in Windows installer, it is now possible to set QupZilla as the default browsers. The second feature, which you may already know from Firefox, is "Switch to tab". If you search from url bar for a page that you have already opened, it will offer you to switch to this tab. You can see how it looks from the screenshot.
New switch to tab feature
Big thanks goes to Franz Fellner for implementing this feature. There were also some smaller changes and bug fixes. I should mention that QupZilla no longer uses /tmp for storing temporary downloads, but it uses its own directory in .qupzilla/tmp that is also automatically cleared on application exit. All these improvements will be part of the new version. I hope I'll be able to release it in next 2 months.