How to fix firefox hangs error?

Although Mozilla Firefox is one of the most reliable and readily used browsers, some potential problems also influence users' browsing experience. Moreover, users' complaints arise especially after users finish updating Firefox. According to their report, Firefox often keeps freezing windows and they can do nothing.
Incompatible accessibility services installed, duplicated Session Restore file created, a sizable browsing history influenced could be the reasons why Firefox keeps freezing. To fix Firefox freeze issue, please read this troubleshooting post and follow the instructions below.

Speed up iOS 9 by Reducing Transparency & Motion

Hard acceleration is created to provide better browsing experience to users, but sometimes it is also a cause of some problems, such as the problem that  Firefox hangs. To make Firefox run smoothly, you can turn off hard acceleration to check if Firefox unfreezes windows.

•  Click on "≡" menu icon.
•  Go to "Options" (Windows) or "Preference" (Mac).
•  Disable "Use recommended performance settings".
•  Disable "Uncheck Use hardware acceleration when available".
•  Restart Firefox.

Prevent Accessibility Services

In most cases, untrustworthy accessibility services have a negative impact on Firefox performance. Probably, that's why Firefox keeps freezing. In this case, you'd better stop accessibility services to access your Firefox. Here's a simple tutorial.

• Go to "Options">"Privacy & Security" section.
• Scroll down to "Permission" section.
• Enable "Prevent accessibility services from accessing your browser" option.
• Click on "Restart Firefox now".

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