Can't enable my external JS script inside html

I have tried several times to enable my external javascript tag in html. I could use it even in last month. Then what I did don’t know. All I remember is once I did install an extension of js (can’t remember now :frowning: ) ,from then I can’t enable it!! Because of this, my jquery and bootstrap tags are also not getting enabled.
Please help me!

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facing the same problem, is there any solution for this???