Mods show up in menu but do not work in gameplay
I've downloaded the .jar of multiple mods.
Using Forge, I did the following:
'Get info' > I change the end of the file to .zip from .jar > open zip > place folder in Application support/minecraft/mods (Using a mac)
All mods I'm attempting to run show up in the mods list in the main menu, but when I play, none of the mods are actually active.
Best Answer
Forge accepts mods in both .zip and .jar formats. You do not need to extract them anywhere. Simply plop them into your mods folder and restart Minecraft.
For more information about Forge and the installation of mods, check out this related question.

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Why is my mod not working?
It is possible that the cache folder is corrupt and because of it, the mods are not loading. Refreshing the cache works here. Bad mods: If there are any corrupt or bad mods in your mods directory, there is a possibility that the entire batch of mods will not work.How do I get my Sims mods to work in game?
To do this, go to Documents > Electronic Arts > The Sims 4 > Mods. Once you're in that folder, simply right-click anywhere and then select "Paste." You'll then see the . package files you've downloaded appear! When you start up your game, the mod or CC you've installed should be there and working perfectly!10 Minecraft Mods Every Player Should Use On Servers
More answers regarding mods show up in menu but do not work in gameplay
Answer 2
Some mods are client-only some mods are intended for servers and some require a server version and a client version to be installed to work properly in single player.
I would suggest you use a special launcher with pre-defined mod packs. They exist because producing a list of mods that work together with stability is a complicated task. Verifying that the correct mods exist and don't crash can take a long time and often a relationship with the developers of the mods.
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