Improve some JS

[Spuds]

Addons could cause a double load, this simply checks if the var was already defined
tiktoc preview was broke
typo in css lead to smaller click zone
other

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.97%. Comparing base (f5fcf8b) to head (992de03).
⚠️ Report is 1 commits behind head on development.

Additional details and impacted files

@@                Coverage Diff                @@
##             development    #3839      +/-   ##
=================================================
- Coverage          47.09%   46.97%   -0.13%     
- Complexity         14370    14372       +2     
=================================================
  Files                375      375              
  Lines              72652    72656       +4     
=================================================
- Hits               34219    34131      -88     
- Misses             38433    38525      +92     

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