Available Corrective release of Firefox 91.0.1, in which several fixes are proposed:
- Fixed Vulnerability (CVE-2021-29991), which allows you to carry out an attack on Separating HTTP headlines. The problem is caused by incorrect adoption of a string translation symbol in HTTP / 3 headers, which allows you to specify a header that will be interpreted as two different heading.
- eliminated Problem With changing the size of the buttons in the tab panel, manifested when loading some sites, in the title of which Used Unicode codes of mathematical symbols.
- Solved The problem, leading to the display of tabs from the windows open in private mode, in conventional windows with View recommendations in the address bar.
Additionally, it can be noted that in Firefox 92, scheduled for September 7, is expected WEBERRDER activation by default for all Linux users, Windows, MacOS and Android users, no exception. In the next release of Firefox 93, support options to disable Webrender will be discontinued (GFX.WeBerander.Force-Legacy-Layers and Moz_weBereRe = 0) and this engine will be required. Webrender is written in the RUST language and allows you to achieve a significant increase in the speed of drawing and reduce the load on the CPU due to the removal on the side of the GPU operations to draw the contents of the page that are implemented through the shaders performed in the GPU. For systems with old video cards or problem graphics drivers in Webrender will be used software rasterization mode (GFX.WeBerander.Software = True).