Over the past few weeks, using 64-bit Microsoft Edge 44.18362.449.0 on Windows 10, I've had occasional problems where the page would display initially, clear itself and then show the following
One URL which I've seen cause this problem when I've tried it several times with Edge, but not with 64-bit FireFox 73.0.1 on Windows 7, or 64-bit Google Chrome 80.0.3987.106 on either Windows 7 or Windows 10, is https://math.stackexchange.com/search?q=%22a%5E2+%2B+b%5E2%22+p+4 .
Also, on at least 6 or 7 occasions, I was editing an answer using Edge when it just exited immediately, treating it as if I had canceled the edit, so I lost my changes. Note that every time this happened was when I tried to type the $ symbol to specify some MathJax text. In particular, this has been happening with posts on Math SE, with this being the only MathJax enabled site I've been posting on during that period.
Note both of these problems have only ever occurred where MathJax is involved. I estimate I've been using Edge with non-MathJax pages for about one-third of the time, enough to make it very unlikely that use of MathJax is just a coincidence. Also, note there's MathJax on the search page results of the URL mentioned earlier.
I've used FireFox far more for creating and editing questions involving MathJax, with no problems like I've described occurring. Over the past few days, I've given up on using Edge for SE sites and, on my Windows 10 machine, have been using Google Chrome only instead, including for viewing & editing posts with MathJax. Likewise, I've never encountered similar problem with Chrome.
I'm fairly certain the problem is just with Microsoft Edge rather than anything to do with SE, which is why I am using the support tag instead of bug.
According to Microsoft Edge 79 to Use the Chromium Browser Engine, the version of Edge I'm using is not using the Chromium engine but is, instead still using Microsoft's proprietary EdgeHMTL. Thus, since the latest version of Edge is not installed by default, as pointed out in TheWanderer's comment, this problem might go away if I upgrade to this latest version.
Although I only saw with Edge, has anybody else has encountered any similar type of problems on any other browsers? Also, although perhaps upgrading Edge will solve it, does anybody know of or has found a solution or work around?
Update: I've downloaded & updated Edge now to the latest beta version of 80.0.361.62, with this using the Chromium engine. The problematic URL I listed above works properly with this version. I'm going to try using it for a while to see if the browser still fails sometimes with MathJax handling, or if it will now always work properly instead.