Firefox interface lags badly (switching tabs, opening menus) , even in safe mode.

Switching between tabs, playing GIFs, playing YouTube videos, typing text and opening the Firefox menu are sometimes laggy.
For example, sometimes when I click on a tab to view it, there will be a delay of a second before its contents are shown.
I tried Google Chrome and it doesn't have this lag. My computer is pretty powerful.
I tried safe mode, but the problem was present there, too.
I tried clearing the cache, but no luck.
I'm not sure what else to say, so if you would like more information, please just ask! Thank you.

Hi amacfie,
Have you looked at our [https://support.mozilla.org/en-US/kb/firefox-slow-or-takes-too-long-start performance troubleshooting section]? There is a lot of good information in there that should help.
Hopefully this helps!

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    Since maybe version 29, my Firefox has become less stable than before and started to crash for seemingly no reason; sometimes it crashed shortly after started with few tabs on, and sometimes it crashed when many tabs were open or (not constantly) with music playing. In short I cannot find an exact pattern by which crashes are triggered. Only one thing is certain, once it broke down, it kept crashing on every restart (even in safe mode or with the user preference directory reset by a complete removal), until a reboot.
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    ====================UPDATE=======================
    Sorry I forgot the crash reports, here they are:
    bp-53142ca2-076d-4413-9d1a-2d2c72140928
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    bp-47244ab2-dfa5-49a9-9345-500342140928
    bp-cc104c04-516f-4f48-a2cf-ff4fa2140926
    bp-f38876f1-48c2-4788-b5aa-54cce2140926
    bp-3057d6a8-59d8-4cfe-8720-338072140926
    bp-c17b4506-fde9-4389-8b2d-ac6a72140923
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    bp-7055424f-8212-4c54-9fcc-39bb32140917
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    bp-ab4e4111-33f1-4d0c-820d-3b8332140917
    bp-be24878b-eda9-4afd-a942-204502140917

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    - Deleted "Norton AntiVirus' → Same result.
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