Q: safari 9.1.1 crashes when I try to add a page to my favourites or rename a page. Any solution?

Go step by step and test.

1. Empty Caches

     Safari > Preference > Advanced

     Checkmark the box beside "Show Develop menu in menu bar".

     Develop menu will appear in the Safari menu bar.

     Click Develop and select "Empty Caches" from the dropdown.

2. Delete Cookies

     Safari > Preferences > Privacy > Cookies and other website data:

     Click the “Details” button.

     Remove all cookies except  ones from Apple, your internet service provider and banks.

3. Disable Extensions and test.

     Safari > Preferences > Extensions

     Select and disable all extensions and test.

     Enable Extensions one by one and test.

     To uninstall any extension, select it and click the “Uninstall” button.

4. Delete com.apple.Safari.plist file and test.

    Empty the Trash.

    Quit all applications.

    Hold the option key down and click the "Go" menu in the Finder menu bar.

    Select "Library" from the drop down.

    Library > Preferences >  com.apple.Safari.plist

    Right click on it and select "Move it to Trash".

    Close the Finder window.

    Restart.    Relaunch Safari.

    If this doesn’t help, “Put Back” the com.apple.Safari.plist

    Right click on  the Trash icon in the Dock and select “Open”.

    Right click on the com.apple.Safari.plist and select “Put Back”.