LTVegan
Tested only with lightspeed because that was the only one I was able to test. I did this and didn't flip the switch even one time for multiple hours (couldn't test for longer) and it worked fine. this was much better than Dextensify and Anastasia but that might be a thing (not a step, but I had other tabs open while doing this, which causes more lag) steps:
for lightspeed filter agent, go to chrome-extension://adkcpkpghahmbopkjchobieckeoaoeem/main.js. for other extensions, find the biggest file for the extension
open chrome://extensions/?id=IDHERE (for lightspeed it's chrome://extensions/?id=adkcpkpghahmbopkjchobieckeoaoeem)
CTRL+A to copy all of the code, then drag the copied text to the tabs bar. this may freeze your chromebook a few times.
start clicking the chrome extension tab (chrome://extensions/?id=IDHERE) a few times, then wait (chromebook is currently frozen).
when your chromebook isn't as frozen, right click the main.js tab and duplicate it.
click the "Allow access to file URLs" (multiple times for good measure) and the first tab should close itself. if BOTH tabs closed themselves, you did something wrong, or just try again.
you should be able to normally use your Chromebook now. you might be able to close the duplicated tab but its reccomended to not close it
(i didnt write any of this)