UI freezes when I open many tabs in browser

**When I open many tabs on browser, UI completely freezes**. In some cases I press Ctrl+Alt+F1 twenty or thirty times, after 15 minutes UI unfreeze, I switch to text terminal, kill browser and after that operating systems work fine. In other cases UI freezes completely, I'm not able to switch to text terminal and I have to reset my computer. I'm experiencing difficulties in one of these browsers: - Firefox with flash plugin enabled (firefox without flash works fine) - Google Chrome (it doesn't matter if flash is enabled or disabled in Chrome) When computer freezes I don't see any strange errors in syslog. Chrome, Firefox and Flash work perfectly on my computer in Windows 7. I have no freezing issues in Windows. My configuration is: > Now I use Linux Mint 17.1 64-bit. > CPU Intel Core i5-4440 (with 4 cores) > 8GB RAM > Samsung 840 EVO 250 GB SSD > I have 2 videos: Intel HD Graphics 4600 and GeForce GT610. > Swap is disabled > CPU cooling works perfectly > Memtest show no errors In the past I had same issue with Google Chrome on different computer: > Back then I used: > Scientific Linux 6.3 64-bit > Intel Pentium E5500 > 4 GB RAM > On that configuration Google Chrome was also freezing X server. If I remember correctly, flash in firefox didn't freeze UI on my old PC. **How can protect myself from UI freezing? Should I change some linux config file to avoid freezing? What is the reason of freezing?**