It is safe to remove all the "extensions.delta...". "user_pref file, how?

After having suffered from the dreaded "research of Delta", I managed to get rid of most of the Delta. I managed to get my nails of the thumb on the new page, but every time I close and re-open Firefox, new pages come in white, and I have to reset.
It seems that I have 23 Delta extensions, always playing on topic: config and also in Firefox Prefs file.
Presumably it is these files that prevent re-opening Firefox if I put earlier.
How to remove these 23 files without upsetting anything else?

Look at this please https://support.mozilla.org/en-US/questions/962167

Tags: Firefox

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