Spotlight + Firefox = issues with RAM and performance
Firefox causes MacOS to index its files with Spotlight and thus Spotlight takes about 4GB of RAM. Happens only with Firefox.
Immediately after start of the Firefox MacOS starts to take +4 GB of RAM because of spotlight. Spotlight seems to actively index Firefox cache.
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No idea what Spotlight is. Use it's configuration to reduce it.
See if Firefox 57.0.1 update took : Go to the Firefox 3 Bar Menu --> Options --> Privacy & Security then under Permissions check the setting to prevent Accessibility Services from accessing your browser.
If was not there, TEST If was there then go to below,
Go the 3 Bar Menu then Options --> General --> Performance and untick everything. change the recommended size lower then see how it runs. Note: 1 = No Multiprocessor = slow again. Try 2 Restart Firefox after making these changes please.
Please let us know if this solved your issue or if need further assistance
It doesn't help. Spotlight (it's a MacOS system searching tool) still takes about 4 GB of RAM after starting Firefox.
Well the above is the solutions to your issue. Suggest disabling Spotlight a MacOS system searching tool from starting at boot and only use when request to Start it.
This is now a Mac Issue, Please follow this up in their forum.
Thank You for Contacting Mozilla Firefox Support.