Rikifives Answer

Apparently it's the browser itself. Fresh intall, I didn't do anything, just went straight to mlpf after browser installation and literally the first time i tried to align content it didn't do so. What's more, it's not just the align buttons, but the entire toolbar. Sometimes these button work, sometimes they don't. For some reason when you click any of the buttons in the toolbar, sometimes it deselects the editor and ignores the button function. For example; Normally: you can type some text, press the bold button and simply continue typing in bold. Now in Vivaldi: sometimes when I press the bold button ---yeah, it deselects the editor and when i try to press space, the entire page shifts down as if I pressed [page down]. I had to click the text editor to put my text cursor back here and continue typing-- and it didn't apply bold. Also, normally, even if you click out of the editor, the moment you press any button in the toolbar it selects the editor so you can instantly type with the format/function you've pressed. And Vivaldi, doesn't give a hay, bUUUt if the buttons do happen to stop working, you can click outside the editor (for it to no longer have the pink outline) and then press the button, the function normally triggers and you're put back in the editor. So like, if you highlight a word you want to make bold, and then pressing the bold button doesn't work, click outside the editor and then click the button. The initial selection will remain and you'll apply bold to the highlighted word. Same goes with other buttons. Aligning doesn't work? Click outside then click the button, current line / highlighted content will be aligned. Well, that would just be a not very convenient workaround... What is causing it, I'm not sure. I've noticed, that in Vivaldi you can kinda highlight the buttons in the toolbar and it highlights the space before icon. Nothing like this can be done in Chrome, for example, these buttons are absolutely not "highlight-able", so to speak. Not that it necessarily has to be related to the issue, but it's just a quirk I've noticed. Otherwise I don't know, the console isn't throwing any errors, things work, but just not always. And I think how you click these buttons matters. It's not 100% consistent, but clicking in the middle of the button seems to glitch more often than clicking corners. And the issue is less likely to happen when you press the button while having the cursor completely still - if you click and drag the button a bit (like if you'd try to highlight the button's icon), it seems to always break for me, which is not the case in Chrome. In Chrome I can click the button like a drunk monke after banana cocktail and everything still works. Like, I can click the button on its left side, slide cursor to its right side and release the mouse button - function normally triggers, whereas doing the same in vivaldi highlights the icon and breaks. Well in Chrome I can even click the button, take my mouse cursor for a walk, slide it back on the button and release mouse button - everything still works and the formatting is applied. Welp, I can't seem to find the source of the problem, but at least one thing is clear, it's not my plugin nor the extension alright.

I think that Tazer dude should make this a thing. I like a good meemay @Rikifive your answer is no.