Using Firefox (and probably other browsers in a similar fashion) you can zoom pages using:
Ctrl + or Ctrl Mousewheel Up to zoom in
Ctrl - or Ctrl Mousewheel Down to zoom out
Ctrl 0 to reset to default zoom
Newer versions of Firefox (newer than my 3.6.24) also allow zooming of text only and creation of zoom icons on the menus.
Another method I outlined here:
https://community.ebay.com/t5/Technical-Issues/Select-and-applying-search-refinements-under-FireFox/...Or you could just remove the warning dialog in similar fashion with one of the methods outlined here:
https://community.ebay.com/t5/Technical-Issues/Cant-get-rid-of-eBay-message-on-my-active-page-screen...(of course the selectors needed for adblocker rules, stylish rules, webdeveloper CSS method, for your dialog would be different than for removing the dialog in that thread, but techniques are the same. The NukeAnythingEnhanced method doesn't care as it just removes what you point at, and the webdeveloper manual delete method would sort of self correct since you would be inspecting the correct element anyway.)
I am working on a bookmarklet approach for these problems. I had a bit of a eureka moment a couple of hours ago while posting that last reply in the last referenced Seller Hub Active page thread. I toss out addon methods, webdeveloper hacker methods, etc that nobody wants to use, but I realized there is an easier way to perform the temporary removals - a bookmarklet.
(note that the ideal way to have these issues automatically and transparently handled is with an element hiding rule in an adblocker)
Maybe 25 lines of JavaScript encapsulated in a bookmarklet (or bookmark) that requires no addons or technical savvy to use - you would just click on it when one of those dialogs appear, and it would just do the same thing as performing the manual web-developer maneuvers. I can probably even make it cover your issue, the Seller Hub page issue in the other thread, the search page issue in the first referenced thread, etc. Can't make it universal, but could just tack on code for each type of dialog. Trying to work on it today, but getting really sidetracked.