Additionally, my vision recently changed, so I grabbed an old pair of tinted glasses, which are why the screen is already too dark. Smoky grey glasses' pinkish tint is even worse. Since everything has a pink tint, grey text is difficult to read. LOL

I suggested using Windows Ease of Access High Contrast Black as a method to help view web pages easier.

I see Opera now has a toggle to "force website pages to use Dark Theme". This is much simpler than using High Contras as I had suggested but there are no adjustments for custom colors.

This is screen grab of what this post looks like

. . . for some reason can't upload pic, sorry about that

My HP laptop has Intel graphics, a gamma of 2.2, and I am unable to change it.

So I went ahead and got the Opera browser's "Make Chrome Text Black" plugin.
It performs admirably! So many changes, no more difficulties with text reading...
Opera should incorporate this into their browser!
Every few minutes, my eyes thank me!

I appreciate your knowledge.
Enjoy your day.

Yeah I HATE!!! ads also, they're everywhere, should rent our foreheads out and make some money ourselves LOL

Not sure where you found ad blocker option in YouTube itself but if there is might also find blocker in Google tied with YT. I use laptop and Opera blocker is extremely efficient. I have to turn blocker off to be able to do a search in YT and then remember to turn back on

If you get that mess of supermarket ads in snail mail you can opt-out of them by going to website of that mail distribution agency but might have to hunt for an opt-out option.

I get an ad piece of crap in yard. They put some pebbles with a business card in sealed baggie so they can just toss them out while they drive by

Don't hesitate to let me know if you find something that works . . . or not.

On Youtube I don't see my comments anymore

I've had that happen. Just above where you enter your comment is "Sort By" option, select Newest might fit it

My post was kind of long winded as Window's High Contrast setup is actually easier done than said and when finished with settings saved is just one click to toggle back and forth when using. The initial Settings setup does require some simple screen adjustments I'm sure you've done before.

I had emailed Jarrad the developer of MCTB as seen in attached reply from him in larger image (my saved high contrast color selection - yellow on black or sometimes red on black) which also shows the "Toggle screen" for Windows you'll get (I hope) if you follow my instructions

and also a sample seen in smaller image of the default Win. contrast difference. The smaller image just shows the default Win contrast toggle.

The issues I had with MCTB were 1) Needed greater contrast options 2) it messed some times with the images in the way I was using it and 3) I'm cheap and Window's High Contrast is free (but does have some minor issues of it's own but I can live with) and doesn't require a fee to use.

Jarrad seems to be a really nice helpful guy so support him if you can.

If you try to use Window's High Contrast and have trouble following my destructions, post here and I'll see if I can help.

BTW I modified Win's High Contrast Black settings.

If you're having difficulty reading light gray text on white background read on.

Ease of Access in Windows Settings has option for high contrast. Has a hotkey combo to turn function on/off but doesn't work for me.

As a workaround for the hotkey fail I've pinned a link to Settings in the taskbar. Then drag edges of Settings page to maximum smallness top/bottom left/right.

Will need to do following routine every time computer is restarted but seems easier to me than starting out with Settings page every time.

Using reduced sized window scroll all the way down to bottom of page which for me puts Ease of Access option at top of page.
Click EoA option. Scroll down a bit and High Contrast option can be found.

Click on High Contrast option and a toggle to turn High Contrast on/off is available.

I've saved a modified high contrast setting. Doesn't fix all the problems with contrast as some setting can't be modified so you might lose the time bar while watching some videos but is easy to toggle back and forth

BTW All Developer Jarrad of Make Chrome Text Black app. Real nice thoughtful guy.

Also my vision has change recently and I've grabbed old pair of glasses which are tinted so screen is too dark already. Even worse smoky gray glasses tint has turned pinkish. So gray text is hard to read -and- everything has pink tint. LOL

OK re-started Opera and it works but has some glitches. In the MCTB menu under "Color" only options are 4 blacks and one blue. "Size" seems to function alright the other 2 "Weight" and "Font" moves and/or alters the message function (bold, italics, etc) icons around. Hiding or spacing them far apart so not easily available.

Also noticed in my email app by using some of the black colors it hides some of the directory text titles appearing to leave gaps between dir. titles. By selecting the MCTB menu "Default" restores back to original.

I've got a feeling that credit card info you supplied to MCTB will be kept on file and you may get hit with another charge without notice each year until you cancel your sub. I've already gone into MCTB "Manage extension..." and cancelled my sub. (extn. still works and I'd guess probably will for a year).

I also have a HP laptop and use it to stream (via HDMI cable) on 55" HDTV. Even with that size screen gray text is a Pita to see but think will be better when I get a chance to try using MCTB on it.