Like 839035, this is caused by the fact that we do a page refresh in each case. We could probably do something smarter since "showTree()" (https://cs.chromium.org/chromium/src/chrome/browser/resources/accessibility/accessibility.js?type=cs&q=toggleAccessibility&sq=package:chromium&g=0&l=250) rewrites the tree anyway.

(Not actually blocked by 839035, just wanted to link them together)

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c409c0daecbfb353ca9fb64c1791284065724481

commit c409c0daecbfb353ca9fb64c1791284065724481
Author: James Wallace-Lee <jamwalla@chromium.org>
Date: Fri Oct 19 22:54:29 2018

chrome://accessibility: Don't refresh page on ToggleAccessibility

When the accessibility mode is toggled for individual pages, update the
single row by calling showTree rather than refreshing the whole page.

Bug:  877705 
Change-Id: I5c7986fc970f9789bb421525ccea5f68f5fd57e9
Reviewed-on: https://chromium-review.googlesource.com/c/1269236
Commit-Queue: James Wallace-Lee <jamwalla@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601338}
[modify] https://crrev.com/c409c0daecbfb353ca9fb64c1791284065724481/chrome/browser/accessibility/accessibility_ui.cc
[modify] https://crrev.com/c409c0daecbfb353ca9fb64c1791284065724481/chrome/browser/resources/accessibility/accessibility.js

Repro the above bug in Canary channel with the below details:

Google Chrome: 72.0.3618.0 (Official Build) canary (64-bit)
Revision: 473cb3615ccd757dbfd816963e699299a0732b59-refs/branch-heads/3618@{#1}
Platform: 11298.0.0 (Official Build) canary-channel samus
Firmware Version:Google_Samus.6300.276.0
ARC: 5143797
JavaScript:V8 7.2.391
Flash:	31.0.0.153 /opt/google/chrome/pepper/libpepflashplayer.so
User Agent: Mozilla/5.0 (X11; CrOS x86_64 11298.0.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3618.0 Safari/537.36
 

# Navigate to chrome://accessibility
# Click "show accessibility tree" for any tab
# Tree expands
# Click on any of the links such as native:false
Expected: tree is re-rendered in place

Actual: Chrome Crashes completely

So bumping up this bug to P1 

++ Dominic and Laura A