Confirmed via devtools that the page is not overflow-y:hidden in Chrome, meaning the site serves different content (or content with script that sets up different styles) to Chrome vs. Firefox. After further investigation I have discovered the following: * The overflow-y:hidden style is set from script that appears to be a minified version of [jquery.nicescroll](https://github.com/inuyaksa/jquery.nicescroll), a jquery plugin whose purpose seems to be to customize the appearance of scrollbars and perform other scrolling customizations * The version of jquery.nicescroll the site appears to be using is 3.4.0, which is 10 years old * The logic to set overflow-y:hidden is in a branch that's [conditioned on](https://github.com/inuyaksa/jquery.nicescroll/blob/e39cc9a391838b16b9b97256656bbe236f33f54b/jquery.nicescroll.js#L701) a variable `cap.cantouch` which is true in Chrome but false in Firefox (note: I'm linking to the corresponding non-minified source of version 3.4.0 for readability). * The relevant logic for setting `cap.cantouch` in turn looks like this: ```js //## Check Chrome desktop with touch support if (cap.cantouch&&cap.ischrome&&!cap.isios&&!cap.isandroid) { this.istouchcapable = true; cap.cantouch = false; // parse normal desktop events } //## Firefox 18 nightly build (desktop) false positive (or desktop with touch support) if (cap.cantouch&&cap.ismozilla&&!cap.isios) { this.istouchcapable = true; cap.cantouch = false; // parse normal desktop events } ``` Note the Chrome block has a check for Android but the Firefox block does not; the code does not seem to consider Firefox for Android at all.
Bug 1842690 Comment 4 Edit History
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Confirmed via devtools that the page is not overflow-y:hidden in Chrome, meaning the site serves different content (or content with script that sets up different styles) to Chrome vs. Firefox. After further investigation I have discovered the following: * The overflow-y:hidden style is set from script that appears to be a minified version of [jquery.nicescroll](https://github.com/inuyaksa/jquery.nicescroll), a jquery plugin whose purpose seems to be to customize the appearance of scrollbars and perform other scrolling customizations * The version of jquery.nicescroll the site appears to be using is 3.4.0, which is 10 years old * The logic to set overflow-y:hidden is in a branch that's [conditioned on](https://github.com/inuyaksa/jquery.nicescroll/blob/e39cc9a391838b16b9b97256656bbe236f33f54b/jquery.nicescroll.js#L701) a variable `cap.cantouch` which is true in Chrome but false in Firefox (note: I'm linking to the corresponding non-minified source of version 3.4.0 for readability). * The [relevant logic](https://github.com/inuyaksa/jquery.nicescroll/blob/e39cc9a391838b16b9b97256656bbe236f33f54b/jquery.nicescroll.js#L334-L344) for setting `cap.cantouch` in turn looks like this: ```js //## Check Chrome desktop with touch support if (cap.cantouch&&cap.ischrome&&!cap.isios&&!cap.isandroid) { this.istouchcapable = true; cap.cantouch = false; // parse normal desktop events } //## Firefox 18 nightly build (desktop) false positive (or desktop with touch support) if (cap.cantouch&&cap.ismozilla&&!cap.isios) { this.istouchcapable = true; cap.cantouch = false; // parse normal desktop events } ``` Note the Chrome block has a check for Android but the Firefox block does not; the code does not seem to consider Firefox for Android at all.